DIRECT MEASUREMENT OF THE 3-DIMENSIONAL PRODUCT VELOCITY DISTRIBUTION FROM PHOTOINITIATED BULB REACTIONS

被引:29
作者
SHAFER, NE
XU, H
TUCKETT, RP
SPRINGER, M
ZARE, RN
机构
[1] STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305
[2] UNIV BIRMINGHAM,SCH CHEM,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND
关键词
D O I
10.1021/j100064a018
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
We describe an apparatus designed to measure the velocity distribution of products of photoinitiated bulb reactions. A photolytic precursor AX and reactant BC are coexpanded into a vacuum chamber. A photolysis laser initiates the reaction sequence AX + hnu --> A + X, A + BC --> AB + C. The C product is detected by sub-Doppler (1 + 1 + 1) resonance-enhanced multiphoton ionization (2D-REMPI) to yield its three-dimensional velocity distribution. If this technique were to be applied to the AB(upsilon',J) product, it would be possible to measure the alignment dependence of the state-to-state differential cross section. We present the experimentally determined velocity distribution of H atoms from the photolysis of HI and D atoms from the reaction H + D2 --> HD + D, and we show that our measurements are consistent with previous studies.
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页码:3369 / 3378
页数:10
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