Photodissociation spectroscopy and dynamics of Si4

被引:11
作者
Hoops, AA
Bise, RT
Choi, HY
Neumark, DM [1 ]
机构
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0009-2614(01)00961-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The photodissociation of Si-4 has been investigated using fast beam photofragment translational spectroscopy. The photofragment yield (PFY) spectrum shows features between 21370 and 22220 cm(-1) corresponding to the 1B(1u) --> (X) over tilde (1)A(g) transition that are attributed to multi-photon dissociation. Single-photon dissociation was examined at higher excitation energies ranging from 5.17 to 6.42 eV. The dominant product channel was found to be Si-3 + Si. Experimental photofragment translational energy distributions were modeled by phase space theory (PST), indicating statistical photo dissociation with no exit barrier along the dissociation coordinate. PST modeling yields a dissociation energy of 4.60 +/- 0.15 eV and DeltaH(f,0)(0) (Si-4) = 6.75 +/- 0.24 eV. (C) 2001 Published by Elsevier Science B.V.
引用
收藏
页码:89 / 96
页数:8
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