Laser induced fluorescence study of Xe(5p56p, 5p56pprime;, 5p57p, and 5p56d) states in Ne and Ar: Radiative lifetimes and collisional deactivation rate constants

摘要

The radiative lifetimes and the collisional deactivation constants by Ne and Ar for all 6p, 6pprime;, 7p, and 6dstates of Xe, except two, were studied by single or twohyphen;photon laser induced fluorescence in the afterglow of a pulsed discharge lsqb;the prime symbol denotes the Xe+(2P1/2) core rather than the Xe+(2P3/2) corersqb;. The radiative lifetimes, 30ndash;48 ns for 6pand 6pprime; states and 68ndash;172 ns for 7pstates, agree well with theoretical values; but, the agreement between experiment and theory is less satisfactory for the 6dstates. The collisional deactivation constants for Ne and Ar are similar if there is a nearby product level. However, the deactivation constants by Ar are much larger than for Ne, if there is a large energy defect for the product state. The product distributions also were measured; Ar collisions give products with larger energy defect than collisions with Ne, which tend to favor nearly isoenergetic product states. The number and type of product channels are related to the locations of crossings in the Rgndash;Xe potential curves and the more attractive nature of Arndash;Xeast; vs Nendash;Xeast;. There is no clear favoring between intrahyphen; and intermultiplet product states of Xeast;. The radiative cascading (6pprime;,7p)rarr;(7sor 4d)rarr;6palso was studied.