The Chemical Physics of Atomic and Molecular Clusters

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The Chemical Physics of Atomic and Molecular Clusters ITALIAN PHYSICAL SOCIETY PROCEEDINGS OF THE INTERNATIONAL SCHOOL OF PHYSICS «ENRICO FERMI» COURSE CVII edited by G. SCOLES Director of the Course VARENNA ON LAKE COMO VILLA MONASTERO 28 June - 7 July 1988 The Chemical Physics of Atomic and Molecular Clusters 1990 NORTH-HOLLAND AMSTERDAM - OXFORD - NEW YORK - TOKYO INDICE G. SCOLES and S. STRINGARI - Preface pag. xvn Gruppo fotografico dei partecipanti al Corso fuori testo PART I. - THEORY R. S. BERRY - Structure and dynamics of Clusters: an introduction. 1. What are Clusters? pag. 3 2. Simulations and diagnostics » 8 21 » 8 2*2 T... » 15 R. S. BERRY - Structure and dynamics of Clusters: phase equilibrium and phase change. 1. Solid and liquid Clusters: their equilibrium » 23 ri » 25 1*2 » 27 2. Simulations » 32 2*1 » 32 2*2 » 37 3. The future » 39 J. JORTNER, D. SCHARF, N. BEN-HORIN, U. EVEN and U. LANDMAN - Size effects in Clusters. Prologue » 43 1. Energetic and thermodynamic size effects » 44 1' 1. Energetic size effects » 44 1*1.1. From molecules to Clusters » 44 1*1.2. From Cluster to bulk Condensed matter » 45 1*2. Isomerization and melting of Clusters » 50 1*3. Experimental interrogation of Cluster isomerization » 58 v VI INDICE 2. Dynamic size effects in electronically excited rare-gas Clusters pag. 64 2"1. Reactive and nonreactive relaxation » 64 2'2. Application of classical molecular-dynamics method » 67 2'3. Analysis of the molecular-dynamics data » 71 2'3.1. Size analysis » 71 2'3.2. Energetics » 72 2'3.3. Configurational relaxation » 72 2'3.4. Mass transport of electronic excitations » 73 2'4. Computational results » 73 2'4.1. Atomic-impurity excitations in Xe*Ar12 and Xe*Ar54 Clusters » 73 2'4.2. Excimer excitations in Xe|Arn and XefAr53 Clusters ... » 81 2'5. Discussion » 91 2'5.1. Dynamics of atomic-impurity excitations » 91 2'5.2. Dynamics of excimer excitations » 92 F. G. AMAR - A structural approach to the analysis of Cluster dynamics. PART I - Introduction » 99 PART II - Melting and isomerization of argon Clusters » 100 1. Background » 100 2. Melting loops » 101 3. Isomers of Ar7 » 103 4. Molecular dynamics and quenching » 104 5. Residence times » 107 6. Lifetime distributions » 111 7. Ar7 melting: summary » 113 PART III - Cooling and dynamic quenching of Ar13 » 113 1. Introduction » 113 2. Brownian dynamics » 114 3. Other quenching techniques » 115 4. Results » 115 5. Conclusions » 119 PART IV - Photodissociation dynamics of Br^ in (C02)TC and Ar„ Clusters » 119 1. Background » 119 2. A model for negative-ion photodissociation » 120 3. Variable-charge calculation » 123 4. Minimum-energy structures » 124 5. Photoexcitation dynamics of minimum-energy structures » 125 6. Thermal averages » 129 7. Caging fraction » 130 8. Discussion » 131 PART V - Summary » 132 INDICE VII R. J. LE ROY - Spectra, phase transitions and «dynamical isomeriza- tions» of mixed Van der Waals Clusters. 1. Introduction pag. 137 2. Methodology, potential-energy surface and equilibrium structures .... » 138 3. Simulating the Cluster spectra » 141 4. Dynamical simulations and phase change behaviour » 146 5. Spontaneously reversing isomerization of an isolated SF6-(Ar)9 Cluster » 150 6. Discussion and speculations » 154 W. ANDREONI - The Car-Parrinello method and its application to microclusters. 1. Introduction » 159 2. The Car-Parrinello method » 159 3. Computational procedure » 162 4. Some test examples » 164 5. Some results: structural and finite-7" properties » 167 6. Final remarks » 173 R. KAWAI, I. L. GARZÖN, X. P. LONG and J. H. WEARE - Simulation of metallic and impure van der Waals Clusters. Introduction » 177 1. Structural and dynamical properties of impure van der Waals Sys­ tems » 178 1" 1. Low-temperature structures » 180 11.1. The A1SB System » 180 1*1.2. The A55B System » 181 1*1.3. The A13B13 system » 182 1*2. The finite-temperature behavior » 182 1*2.1. Heating in the A12B, A1SB and A55ß Systems » 182 1*2.2. Heating in the A1SB13 System » 186 2. Car and Parrinello methods for metallic Clusters » 187 S. STRINGARI - Clusters of quantum liquids. 1. Introduction » 199 2. Bulk and surface properties of 4He and 3He » 200 2*1. Bulk properties » 200 2*2. Surface properties » 203 3. Ground-state properties of helium Clusters » 205 3' 1. The density functional approach » 205 3*2. Ground-state properties of 4He Clusters » 208 VIII INDICE 3'3. Ground-state properties of 3He Clusters pag. 212 3'4. 3He impurities on 4He Clusters » 219 4. Collective excitations in helium Clusters » 223 4' 1. Collective modes in 4He Clusters \ » 223 4' 1.1. Compression modes » 225 4'1.2. Surface excitations » 227 4'2. Collective modes in 3He Clusters » 227 4*2.1. Density excitations » 228 4'2.2. Magnetic excitations » 229 5. Conclusions » 233 X. CAMPI - Fragmentation of Clusters. 1. Introduction » 237 2. Survey of experimental data » 237 2'1. Fragmentation of nuclei » 237 2'2. Fragmentation of atomic Clusters » 244 3. Elements of Cluster fragmentation theory » 248 31. Partitions >» 248 3'2. Geometrical modeis » 250 3'3. Statistical equilibrium » 256 3"4. Rate equation theory » 257 4. Signals of scaling in Cluster fragmentation » 258 4'1. Critical behaviour and critical exponents » 259 4'2. Finite-size scaling » 265 Summary » 266 PART IL - SPECTROSCOPY AND PHOTODISSOCIATION R. 0. WATTS - Infrared spectroscopy of large Clusters. 1. Introduction » 271 2. Experimental methods » 272 3. Experimental results » 276 4. Vibrational-spectroscopy theory » 287 5. Semi-classical calculations of band shapes » 299 6. Quantum Simulation » 311 7. Summary » 326 D. J. LEVANDIER, M. MENGEL, J. MCCOMBIE and G. SCOLES - Infrared spectroscopy in and on argon Clusters: matrix and surface spectroscopy in the gas phase. 1. Introduction » 331 2. Experimental background » 332 INDICE IX 3. Clusters as microreactors: complex formation between CH3F and HCl in argon pag. 334 4. The surface of Clusters: a unique environment for spectroscopy and chemical dynamics » 338 5. Clusters and glasses » 345 6. Phase coexistence in Clusters: hot solids and cold liquids » 351 7. Clusters as microsolutions: will the would-be solute be admitted in or left on the surface? » 352 G. DELACRETAZ, P. FAYET, J. P. WOLF and L. WÖSTE - Spectroscopy, reactivity and photodynamics of size-selected metal Clusters. 1. Introduction » 359 2. Spectroscopic approaches to metal Clusters » 359 2' 1. Cluster beam sources for performing spectroscopy » 359 2'2. Eesonant two-photon ionization and depletion spectroscopy » 363 2'3. As an example: spectroscopy of Na3 » 372 2*3.1. The ground State of Na3 » 372 2'3.2. The 675 nm System (A-state) » 372 2'3.3. The510nmSystem(ß-state) » 373 2'3.4. The560nmSystem(ß'-state) » 374 2'3.5. The 475nm System (C-state) »> 375 2'3.6. The predissociated 420 nm System (D-at&te) » 376 3. Chemical reactions of metal Clusters » 378 3'1. Production of size-selected metal Cluster ions » 378 3'2. Experimental set-up » 381 3'3. Cluster-molecule reactions » 384 4. Photodynamics of metal Clusters » 389 M. MOSKOVITS - Size-dependent properties in small metal and semiconductor Clusters » 397 W. D. KNIGHT - Structures of metal Clusters. 1. Introduction » 413 2. Shell structure » 414 3. Experimental properties » 419 3'1. Abundance and stability » 419 3'2. Ionization potential » 420 3'3. Static electric polarizability » 422 3'4. Giant dipole resonance » 422 4. Conclusions and future directions » 424 1. X INDICE T. D. MARK, A. STAMATOVIC, F. HOWORKA, P. SCHEIER and G. WALDER - Interaction between visible laser light and expanding van der Waals Cluster beams. 1. Introduction pag. 427 2. Experimental technique » 428 3. Results » 429 4. Experimental tests » 440 4' 1. Laser power dependence » 440 4'2. Laser wavelength dependence » 443 4'3. Laser focus dependence » 443 4'4. Dependence on irradiation geometry » 444 4'5. Various further tests and observations » 444 5. Analysis (cross-section) and Interpretation (dissociation mechanism) .. » 445 D. RAY, N. E. LEVINGER and W. C. LINEBERGER - Spectroscopy and dynamics of «van der Waals» Cluster ions. 1. Introduction » 451 2. Discussion » 452 2' 1. Experimental method » 452 2'2. Optical absorption in «van der Waals» Cluster ions » 454 2'3. Photodissociation dynamics of «van der Waals» Cluster ions ..... » 457 2'4. Photochemistry in Cluster ions » 461 3. Conclusion » 463 S. T. ARNOLD, J. V. COE, J. G. EATON, C. B. FREIDHOFF, L. KIDDER, G. H. LEE, M. R. MANAA, K. M. MCHUGH, D. PATEL- MISRA, H. W. SARKAS, J. T. SNODGRASS and K. H. BOWEN - Photodetachment spectroscopy of negative Cluster ions. 1. Introduction » 467 2. Experimental » 469 3. Results and discussion » 470 3*1. Ion-molecule complexes: Cluster anions with localized excess negative charges » 470 3'2. More complicated cases: Cluster anions with excess Charge dispersal » 479 3'3. Alkali metal Cluster anions » 484 3'4. Water Cluster anions » 486 C. BRECHIGNAC and PH. CAHUZAC - Excitation of free metal Clusters. 1. Introduction » 491 2. Photoexcitation of alkali Cluster ions » 491 INDICE KI 2*1. Unimolecular dissoeiation following electronic excitation pag. 491 2'1.1. Experimental procedure » 493 2'1.2. Energetic of the unimolecular dissoeiation » 494 2'1.3. Dynamics ofthe unimolecular dissoeiation » 496 2'2. Photoinduced dissoeiation: a probe to follow electronic excitation » 500 3. Photoionization of metal Clusters » 502 3'1. Direct ionization » 503 3'1.1. Charge exchange between Na^" Cluster and Cs atoms: generation of neutral mass-selected Cluster beam » 503 3' 1.2. Photoionization of mass-selected neutral Clusters » 506 3'2. Autoionization process » 507 PART III. - MASS SPECTROSCOPY SCATTERING AND CHEMICAL PROP- ERTIES G. TORCHET, J. FARGES, M. F. DE FERAUDY and B. RAOULT - Electron diffraction studies of Clusters produced in a free jet expansion. 1. Introduction » 513 2. Experimental methods » 514 2' 1. Cluster beam » 514 2'2. Electron diffraction » 515 2'3.
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