AMOLF Institutional Repository: AMOLF Institutional Repository

A Fock space representation for the quantum Lorentz gas Article

J. Math. Phys., 725-741.

H. Maassen and A. Tip

January 1995
Half-cycle microwave excitation of rubidium Rydberg atoms Article

Phys. Rev. Lett., 355-358.

G.M. Lankhuijzen and L.D. Noordam

January 1995
Erbium in crystal silicon: optical activation, excitation, and concentration limits Article

J. Appl. Phys., 1256-1262.

A. Polman (Albert), G.N. van den Hoven, J.S. Custer, J.H. Shin, R. Serna and P.F.A. Alkemade

January 1995
Computer simulation of colloid-polymer mixtures Article

Physica A, 130-137.

E.J. Meijer and D. Frenkel

January 1995
Asymptotics of a time correlation function in multiple recurrent scattering of scalar waves Article

Z. angew. Math. Phys., 61-69.

N.M. Temme, F. Vitalis, B.A. van Tiggelen and A. Lagendijk

January 1995
Random laser? Article

Nature, 203-204.

D.S. Wiersma, M.P. van Albada and A. Lagendijk

January 1995
Rydberg-electron wave-packet dynamics in parallel electric and magnetic fields and evidence for stabilization Article

Phys. Rev. A, 611-619.

H.H. Fielding, J. Wals, W.J. van der Zande and H.B. van Linden van den Heuvell

January 1995
Analytical pyrolysis experiments of Titan aerosol analogues in preparation for the Cassini Huygens mission Article

Adv. Space Res., 335-342.

P. Ehrenfreund, J.J. Boon, J.M. Commandeur, C. Sagan, W.R. Thompson and B. Khare

January 1995
Damage annealing and epitaxial realignment of ion-implanted Si Dissertation

A. Cacciato

December 1994
Dissociation dynamics in ionic Rydberg states of diatomic molecules Dissertation

A.B. van der Kamp

October 1994
A new hydrogen particle source Dissertation

M.J. de Graaf

September 1994
Direct scattering and chemisorption Dissertation

A.E. Wiskerke

September 1994
Stability, orientation, and application of ion implanted iron = stabiliteit, orientation, and application of ion implanted iron Dissertation

L. de Wit

September 1994
The effect of entropy on the stability and structure of complex fluids Dissertation

M. Dijkstra (Marjolein)

September 1994
Surface dynamics studied with a high-temperature high-speed scanning tunnelling microscope Dissertation

L.K. Kuipers (Kobus)

June 1994
Coherent processes in atoms driven by short laser pulses Dissertation

B. Broers

June 1994
A combined anatomical and pyrolysis mass spectrometric study of peatified plant tissues Dissertation

E. van der Heijden

May 1994
Negative ions in strong laser fields Dissertation

M.D. Davidson

March 1994
Interactions at surfaces: quantumchemical studies Dissertation

E.J.J. Kirchner

February 1994
Molecular-photoionization and electron impact ionization cross sections of polyatomic molecules Dissertation

M. Bobeldijk

February 1994
Surfaces between melting and non-melting Dissertation

H.M. van Pinxteren

January 1994
Had Niels Bohr het zelf bedacht? Article

De Gids, 597-600.

F.W. Saris

January 1994
Enhancement of reflectivity of multilayer mirrors for soft x-ray projection lithography by temperature optimization and ion bombardment Article

Microelectron. Eng., 215-218.

E. Louis, H.-J. Voorma, N.B. Koster, L. Shmaenok, F. Bijkerk, R. Schlatmann, J. Verhoeven (Jan), Y.Y. Platonov, G.E. van Dorssen and H.A. Padmore

January 1994
On the constellations of Shi Shen's astronomical school during the Han dynasty Article

Stud. Hist. Natural Sci., 13(2), 123-138.

S. Xiaochun, B. Shuren and J. Kistemaker

January 1994
Dynamics and phase transitions at surfaces observed with STM and ion scattering In Proceedings

J.W.M. Frenken, L.K. Kuipers (Kobus), M.S. Hoogeman and H.M. van Pinxteren

January 1994
1,5 µm Room-temperature luminescence from erbium in oxygen-doped silicon grown by molecular beam epitaxy In Proceedings

R. Serna, M. Lohmeier, E. Vlieg (Elias) and A. Polman (Albert)

January 1994
Er3+ absorption and optical gain in Al2O3 waveguides In Proceedings

G.N. van den Hoven, E. Radius, E. Snoeks, A. Polman (Albert), C. van Dam, J.W.M. van Uffelen and M.K. Smit

January 1994
Resonantly induced dipole-dipole interactions in the diffusion of scalar waves Article

Phys. Rev. B, 16729-16732.

B.A. van Tiggelen and A. Lagendijk

January 1994
Ab initio molecular dynamics with excited electrons Article

Phys. Rev. Lett., 2599-2602.

A. Alavi, J. Kohanoff, M. Parrinello and D. Frenkel

January 1994
Gestructureerd organiseren (slot) Article

Secret. Mag., 12(Article number: 32), 34-36.

L. Roos

January 1994
Probability distribution of multiple scattered light measured in total transmission Article

Phys. Rev. Lett., 2567-2570.

J.F. de Boer (Johannes), M.C.W. van Rossum, M.P. van Albada, T.M. Nieuwenhuizen and A. Lagendijk

January 1994
Boron doping of silicon using coalloying with aluminium Article

Appl. Phys. Lett., 2792-2794.

W.C. Sinke (Wim), C. Leguijt, A.W. Weeber, P.F.A. Alkemade and L.A. Verhoef

January 1994
Structural studies on cellulose pyrolysis and cellulose chars by PYMS, PYGCMS, FTIR, NMR and by wet chemical techniques Article

Biomass & Bioenergy, 25-32.

J.J. Boon, I. Pastorova, R.E. Botto and P.W.F. Arisz

January 1994
De zachte sector van de fysica Book Chapter

D. Frenkel

January 1994
Climbing a ladder system by frequency-chirped laser pulses In Proceedings

L.D. Noordam, P. Balling, B. Broers, J.H. Hoogenraad, D.J. Maas, P.W. van Amersfoort, H.B. van Linden van den Heuvell, A.F.G. van der Meer and R.B. Vrijen

January 1994
Programmable wave-function engineering is Cs Rydberg states Book Chapter

P.H. Bucksbaum, D.W. Schumacher, D. Pinkos, J.H. Hoogenraad, J.L. Krause and K.R. Wilson

January 1994
Negative ion formation in proton Ba/Ag(111) collisions: effects of the surface structure In Proceedings

W.R. Koppers, B. Berenbak, D. Vlachos, U. van Slooten and A.W. Kleyn

January 1994
Medium-energy ion scattering study of the structure of Ba and BaO on W(100) In Proceedings

U. van Slooten, A.M. Molenbroek, J.W.M. Frenken, S. Deckers and A. Manenschijn

January 1994
Isostructural solid-solid transition in crystalline systems with short-ranged interaction Article

Phys. Rev. E, 4880-4890.

P.G. Bolhuis (Peter), M.H.J. Hagen and D. Frenkel

January 1994
Microscopic description of anchoring transitions Article

Mol. Cryst. Liq. Cryst., 219-229.

B. Jérôme

January 1994
Structure analysis of the HF-treated Si(111): H surface with medium-energy ion scattering Article

Surf. Sci., 261-266.

A. Nishiyama, G. ter Horst, M. Lohmeier, A.M. Molenbroek and J.W.M. Frenken

January 1994
Berry's phase and weak localization in multiple point-dipole scattering In Proceedings

M.P. van Albada

January 1994
Precise weak localization experiments reveal recurrent light scattering in random structures In Proceedings

D.S. Wiersma, M.P. van Albada and A. Lagendijk

January 1994
Characterization of amorphous silicon In Proceedings

R.A. Hakvoort, A. van Veen, H. Schut, M.J. van den Boogaard, A. Berntsen, S. Roorda, P.A. Stolk and A.H. Reader

January 1994
A combined pyrolysis mass spectrometric and light microscopic study of peatified Calluna wood isolated from raised bog peat deposits Article

Org. Geochem., 903-919.

E. van der Heijden and J.J. Boon

January 1994
Onsager chains: Semi-flexible polymers revisited In Proceedings

B.M. Mulder (Bela)

January 1994
Gradient index multilayers for X-ray reflection In Proceedings

R. Schlatmann, A. Keppel, S. Bultman and J. Verhoeven (Jan)

January 1994
Diffuse x-ray scattering measurements from multilayers In Proceedings

R. Schlatmann, J.D. Shindler and J. Verhoeven (Jan)

January 1994
Numerical study of the phase diagram of a mixture of spherical and rodlike colloids Article

J. Chem. Phys., 9869-9875.

P.G. Bolhuis (Peter) and D. Frenkel

January 1994
Accurate analysis of coherent backscattering revealing recurrent scattering of light in disordered media In Proceedings

D.S. Wiersma, M.P. van Albada and A. Lagendijk

January 1994
Resonant recurrent scattering between dielectric spheres In Proceedings

B.A. van Tiggelen and A. Lagendijk

January 1994
Experimental evidence for loop-type photon trajectories in random media with strong disorder In Proceedings

M.P. van Albada, D.S. Wiersma and A. Lagendijk

January 1994
Evidence for predissociation of N2 a 1Πg(v≥7) by direct coupling to the A' 5Σ+g state Article

J. Chem. Phys., 9271-9279.

A.B. van der Kamp, L.D.A. Siebbeles (Laurens), W.J. van der Zande and P.C. Cosby

January 1994
Experiments on Rydberg wave packets : Proc. NATO Adv. Study Inst. Laser Interactions with Atoms, Solids, and Plasmas, held August 17-25, 1992, in Carg In Proceedings

L.D. Noordam, A. ten Wolde and H.B. van Linden van den Heuvell

January 1994
X-ray reflection, a technique for measuring sputtering yields of thin films Article

Nucl. Instrum. Methods Phys. Res. B, 395-403.

J. Verhoeven (Jan), A. Keppel, R. Schlatmann, Y. Xue and I.V. Katardjiev

January 1994
Gestructureerd organiseren (deel 3) Article

Secret. Mag., 48-49.

L. Roos

January 1994
Gestructureerd organiseren (deel 2) Article

Secret. Mag., 28-30.

L. Roos

January 1994
Gestructureerd organiseren (deel 1) Article

Secret. Mag., 25-28.

L. Roos

January 1994
Laser-assisted Auger decay In Proceedings

J.M. Schins, P. Breger, Pierre Agostini, R.C. Constantinescu, H.G. Muller, G. Grillon, A. Antonetti and A. Mysyrowicz

January 1994
Stueckelberg oscillations in half-cycle pulse excitation of Rb Rydberg atoms at 50 MHz and 3 GHz In Proceedings

G.M. Lankhuijzen and L.D. Noordam

January 1994
Interference in climbing a quantum ladder system with frequency-chirped laser pulses In Proceedings

D.J. Maas, P. Balling and L.D. Noordam

January 1994
THz-multiphoton ionization of Rydberg atoms In Proceedings

J.H. Hoogenraad, R.B. Vrijen, L.D. Noordam, A.F.G. van der Meer and P.W. van Amersfoort

January 1994
Excitation dynamics in resonance enhanced multiphoton ionization of atoms with short intense laser pulses In Proceedings

R.B. Vrijen and L.D. Noordam

January 1994
Adiabatic stabilization: The observation of the surviving population In Proceedings

N.J. van Druten, R.C. Constantinescu, J.M. Schins, H. Nieuwenhuize and H.G. Muller

January 1994
Spontaneous emission rate of erbium implanted in silica near a dielectric interface In Proceedings

E. Snoeks, A. Lagendijk, M.L. Brongersma (Mark) and A. Polman (Albert)

January 1994
Atomic electron wave packets studied with a time resolved phase-modulated technique In Proceedings

B. Broers, J.F. Christian, J. Wals, H.H. Fielding, J.H. Hoogenraad, L.C. Snoek, W.J. van der Zande, L.D. Noordam and H.B. van Linden van den Heuvell

January 1994
Towards time resolved low-energy electron diffraction In Proceedings

D. Abma, G.M. Lankhuijzen and L.D. Noordam

January 1994
Densification, anisotropic deformation, and plastic flow of SiO2 during MeV heavy ion irradiation Article

Appl. Phys. Lett., 2487-2489.

E. Snoeks, A. Polman (Albert) and C.A. Volkert

January 1994
Transient diffusion of Ga in amorphous silicon Article

J. Appl. Phys., 5719-5723.

P.M. Zagwijn, W.J. Huisman, A. Polman (Albert), E. Vlieg (Elias), A.H. Reader and D.J. Gravesteijn

January 1994
Pyrolysis mass spectrometry and pyrolysis gas chromatography-mass spectrometry of ester- and ether-linked phenolic acids in coastal bermudagrass cell walls Article

Phytochemistry, 1143-1151.

W.H. Morrison and Marcel M. Mulder

January 1994
A comparative study of Ar/Ag(111) potentials Article

J. Chem. Phys., 9155-9163.

E.J.J. Kirchner, A.W. Kleyn and E.J. Baerends

January 1994
Locating objects with diffuse light In Proceedings

P.N. den Outer, M.C.W. van Rossum, T.M. Nieuwenhuizen and A. Lagendijk

January 1994
Interference in climbing a quantum ladder system with frequency-chirped laser pulses Article

Phys. Rev. A, 4276-4285.

P. Balling, D.J. Maas and L.D. Noordam

January 1994
Ionization suppression of Rydberg atoms by short laser pulses Article

Phys. Rev. A, 4133-4138.

J.H. Hoogenraad, R.B. Vrijen and L.D. Noordam

January 1994
Adiabatic stabilization against photoionization: an experimental study Article

Phys. Rev. A, 4085-4098.

M.P. de Boer, J.H. Hoogenraad, R.B. Vrijen, R.C. Constantinescu, L.D. Noordam and H.G. Muller

January 1994
Anharmonicity but absence of surface melting on Al(001) Article

Phys. Rev. B, 11132-11141.

A.M. Molenbroek and J.W.M. Frenken

January 1994
Stabilization: The experiment In Proceedings

H.G. Muller and M.P. de Boer

January 1994
Multiphoton ionization of magnesium and covariance mapping Book Chapter

N.J. van Druten, R. Trainham and H.G. Muller

January 1994
Adiabatic stabilization In Proceedings

M. Gavrila (Mihai)

January 1994
N+2 (A 2Pu ¬X 2S+g) excitation in the charge-exchange collision with caesium: two-electron effects at keV energies Article

J. Phys. B, 5037-5053.

A.B. van der Kamp, J.H.M. Beijersbergen, P.C. Cosby and W.J. van der Zande

January 1994
Can light be localized? Book Chapter

A. Lagendijk

January 1994
Very low surface recombination velocities on 2.5 W cm Si wafers, obtained with low-temperature PECVD of Si-oxide and Si-nitride Article

Sol. Energy Mater. Sol. Cells, 177-181.

C. Leguijt, J.A. Eikelboom, P.H. Amesz, R.A. Steeman, W.C. Sinke (Wim), P.M. Sarro, L.A. Verhoef, P.-P. Michiels, Z.H. Chen and A. Rohatgi

January 1994
Vibronic processes in gas phase and surface scattering, a workshop dedicated to Professor Joop Los on the occasion of his 70th birthday Article

Comments At. Mol. Phys., 251-259.

A.W. Kleyn and W.J. van der Zande

January 1994
Rotational rainbow scattering of oriented molecules Article

Surf. Rev. Lett., 157-173.

A.W. Kleyn

January 1994
Manipulation of lignin quality by downregulation of cinnamyl alcohol dehydrogenase Article

Plant J., 339-350.

C. Halpin, M.E. Knight, G.A. Foxon, M.M. Campbell, A.M. Boudet, J.J. Boon, B. Chabbert, M.-T. Tollier and W. Schuch

January 1994
De tweede jeugd van entropie Book Chapter

D. Frenkel

January 1994
Two-dimensional position sensitive detection for medium-energy ion scattering Article

Nucl. Instrum. Methods Phys. Res. B, 137-149.

P.M. Zagwijn, A.M. Molenbroek, J. Vrijmoeth, G.J. Ruwiel, R.M. Uiterlinden, J. ter Horst, J. ter Beek and J.W.M. Frenken

January 1994
Short-pulse microwave ionization of Na Rydberg atoms Article

Phys. Rev. A, 2502-2507.

M. Gatzke, B. Broers, L.D. Noordam, R.B. Watkins and T.F. Gallagher

January 1994
Quantitative pyrolysis-gas chromatography-mass spectrometry and pyrolysis-mass spectrometry of chlorolignosulphonic acids Article

TrAC, Trends Anal. Chem., 169-176.

W.M.G.M. van Loon and J.J. Boon

January 1994
Demixing in a hard rod-plate mixture Article

J. Phys. II, 1763-1769.

R.H.H.G. van Roij and B.M. Mulder (Bela)

January 1994
Observation of laser-assisted Auger decay in argon Article

Phys. Rev. Lett., 2180-2183.

J.M. Schins, P. Breger, Pierre Agostini, R.C. Constantinescu, H.G. Muller, G. Grillon, A. Antonetti and A. Mysyrowicz

January 1994
Cellulose char structure: a combined analytical Py-GC-MS, FTIR, and NMR study Article

Carbohydr. Res., 27-47.

I. Pastorova, R.E. Botto, P.W.F. Arisz and J.J. Boon

January 1994
H2+ in superintense laser fields: alignment and spectral restructuring Article

Phys. Rev. Lett., 2039-2042.

J. Shertzer, A. Chandler and M. Gavrila (Mihai)

January 1994
Atomic-detail simulation studies of tilted smectics Article

J. Phys.: Condens. Matter, 261-268.

M.A. Glaser, R. Malzbender, N.A. Clark and D.M. Walba

January 1994
Rapid thermal annealing of MeV erbium implanted LiNbO3 single crystals for optical doping Article

Appl. Phys. Lett., 225-227.

M. Fleuster, C. Buchal, E. Snoeks and A. Polman (Albert)

January 1994
Determination of phase diagrams for the hard-core attractive Yukawa system Article

J. Chem. Phys., 4093-4097.

M.H.J. Hagen and D. Frenkel

January 1994
Surface induced dissociation of benzene and benzene derivatives: Modifications of a time of flight apparatus In Proceedings

J.H.M. Beijersbergen, J. de Maaijer-Gielbert, P.G. Kistemaker and T.L. Weeding

January 1994
A new multi-purpose external ion source for a FT-ICR-MS with a hydrocarbon free UHV system In Proceedings

R.M.A. Heeren (Ron), J.J. Boon and P. Caravatti

January 1994
Temperature dependence and quenching processes of the intra-4¦ luminescence of Er in crystalline Si Article

Phys. Rev. B, 16313-16320.

S. Coffa, F. Priolo (Francesco), G. Franzò (Giorgia), A. Polman (Albert) and R. Serna

January 1994
Time and angle resolved calculations in delayed photodissociation Article

Chem. Phys., 205-219.

W.J. van der Zande, F. Vitalis and L.D.A. Siebbeles (Laurens)

January 1994

Available Years

Publications from 2024

A Fock space representation for the quantum Lorentz gas Article

Half-cycle microwave excitation of rubidium Rydberg atoms Article

Erbium in crystal silicon: optical activation, excitation, and concentration limits Article

Computer simulation of colloid-polymer mixtures Article

Asymptotics of a time correlation function in multiple recurrent scattering of scalar waves Article

Random laser? Article

Rydberg-electron wave-packet dynamics in parallel electric and magnetic fields and evidence for stabilization Article

Analytical pyrolysis experiments of Titan aerosol analogues in preparation for the Cassini Huygens mission Article

Damage annealing and epitaxial realignment of ion-implanted Si Dissertation

Dissociation dynamics in ionic Rydberg states of diatomic molecules Dissertation

A new hydrogen particle source Dissertation

Direct scattering and chemisorption Dissertation

Stability, orientation, and application of ion implanted iron = stabiliteit, orientation, and application of ion implanted iron Dissertation

The effect of entropy on the stability and structure of complex fluids Dissertation

Surface dynamics studied with a high-temperature high-speed scanning tunnelling microscope Dissertation

Coherent processes in atoms driven by short laser pulses Dissertation

A combined anatomical and pyrolysis mass spectrometric study of peatified plant tissues Dissertation

Negative ions in strong laser fields Dissertation

Interactions at surfaces: quantumchemical studies Dissertation

Molecular-photoionization and electron impact ionization cross sections of polyatomic molecules Dissertation

Surfaces between melting and non-melting Dissertation

Had Niels Bohr het zelf bedacht? Article

Enhancement of reflectivity of multilayer mirrors for soft x-ray projection lithography by temperature optimization and ion bombardment Article

On the constellations of Shi Shen's astronomical school during the Han dynasty Article

Dynamics and phase transitions at surfaces observed with STM and ion scattering In Proceedings

1,5 µm Room-temperature luminescence from erbium in oxygen-doped silicon grown by molecular beam epitaxy In Proceedings

Er3+ absorption and optical gain in Al2O3 waveguides In Proceedings

Resonantly induced dipole-dipole interactions in the diffusion of scalar waves Article

Ab initio molecular dynamics with excited electrons Article

Gestructureerd organiseren (slot) Article

Probability distribution of multiple scattered light measured in total transmission Article

Boron doping of silicon using coalloying with aluminium Article

Structural studies on cellulose pyrolysis and cellulose chars by PYMS, PYGCMS, FTIR, NMR and by wet chemical techniques Article

De zachte sector van de fysica Book Chapter

Climbing a ladder system by frequency-chirped laser pulses In Proceedings

Programmable wave-function engineering is Cs Rydberg states Book Chapter

Negative ion formation in proton Ba/Ag(111) collisions: effects of the surface structure In Proceedings

Medium-energy ion scattering study of the structure of Ba and BaO on W(100) In Proceedings

Isostructural solid-solid transition in crystalline systems with short-ranged interaction Article

Microscopic description of anchoring transitions Article

Structure analysis of the HF-treated Si(111): H surface with medium-energy ion scattering Article

Berry's phase and weak localization in multiple point-dipole scattering In Proceedings

Precise weak localization experiments reveal recurrent light scattering in random structures In Proceedings

Characterization of amorphous silicon In Proceedings

A combined pyrolysis mass spectrometric and light microscopic study of peatified Calluna wood isolated from raised bog peat deposits Article

Onsager chains: Semi-flexible polymers revisited In Proceedings

Gradient index multilayers for X-ray reflection In Proceedings

Diffuse x-ray scattering measurements from multilayers In Proceedings

Numerical study of the phase diagram of a mixture of spherical and rodlike colloids Article

Accurate analysis of coherent backscattering revealing recurrent scattering of light in disordered media In Proceedings

Resonant recurrent scattering between dielectric spheres In Proceedings

Experimental evidence for loop-type photon trajectories in random media with strong disorder In Proceedings

Evidence for predissociation of N2 a 1Πg(v≥7) by direct coupling to the A' 5Σ+g state Article

Experiments on Rydberg wave packets : Proc. NATO Adv. Study Inst. Laser Interactions with Atoms, Solids, and Plasmas, held August 17-25, 1992, in Carg In Proceedings

X-ray reflection, a technique for measuring sputtering yields of thin films Article

Gestructureerd organiseren (deel 3) Article

Gestructureerd organiseren (deel 2) Article

Gestructureerd organiseren (deel 1) Article

Laser-assisted Auger decay In Proceedings

Stueckelberg oscillations in half-cycle pulse excitation of Rb Rydberg atoms at 50 MHz and 3 GHz In Proceedings

Interference in climbing a quantum ladder system with frequency-chirped laser pulses In Proceedings

THz-multiphoton ionization of Rydberg atoms In Proceedings

Excitation dynamics in resonance enhanced multiphoton ionization of atoms with short intense laser pulses In Proceedings

Adiabatic stabilization: The observation of the surviving population In Proceedings

Spontaneous emission rate of erbium implanted in silica near a dielectric interface In Proceedings

Atomic electron wave packets studied with a time resolved phase-modulated technique In Proceedings

Towards time resolved low-energy electron diffraction In Proceedings

Densification, anisotropic deformation, and plastic flow of SiO2 during MeV heavy ion irradiation Article

Transient diffusion of Ga in amorphous silicon Article

Pyrolysis mass spectrometry and pyrolysis gas chromatography-mass spectrometry of ester- and ether-linked phenolic acids in coastal bermudagrass cell walls Article

A comparative study of Ar/Ag(111) potentials Article

Locating objects with diffuse light In Proceedings

Interference in climbing a quantum ladder system with frequency-chirped laser pulses Article

Ionization suppression of Rydberg atoms by short laser pulses Article

Adiabatic stabilization against photoionization: an experimental study Article

Anharmonicity but absence of surface melting on Al(001) Article

Stabilization: The experiment In Proceedings

Multiphoton ionization of magnesium and covariance mapping Book Chapter

Adiabatic stabilization In Proceedings