In:
Israel Journal of Chemistry, Wiley, Vol. 29, No. 4 ( 1989-01), p. 393-403
Abstract:
In this paper, using the particular case of the Cs(7P) + H 2 → CsH + H reaction, it is shown how the application of high‐resolution continuous‐wave (CW) laser techniques to crossed‐beam experiments can yield information about the mechanism of reactive collisions. Firstly, CW laser techniques allow the preparation of Cs atoms in given fine and hyperfine structure levels; for this reaction, measurements of hyperfine cross‐sections vs. different orientations of the atomic orbital show how the molecular symmetry of the reagents controls the efficiency of the harpooning process involved. Secondly, the laser‐induced fluorescence (LIF) technique of detection allows the characterization of CsH products in given rotational levels. The high‐precision scanning of the CW laser frequency over absorption profiles of CsH molecules results in the determination of the Doppler shifts, which are associated with the recoil velocity of the products; two laser beam arrangements are used to provide the product velocity and angular scattering probability. A “forward” peaking is discovered, which depends on collision energy but not on product rotation. Finally, the technique of saturated absorption is applied for the first time to reactive experiments; it could lead to methods for selecting products which scatter in a given plane or in given directions.
Type of Medium:
Online Resource
ISSN:
0021-2148
,
1869-5868
DOI:
10.1002/ijch.198900050
Language:
English
Publisher:
Wiley
Publication Date:
1989
detail.hit.zdb_id:
2066481-3
Permalink