Joseph L. Cox

Date of Award

3-2001

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Engineering Physics

First Advisor

Glen P. Perram, PhD

Abstract

Temporally-resolved laser induced fluorescence ofhigh vibrational levels in Bi2 A(0+u) above and below the predissociation limit of v'=22 were investigated by observing total fluorescence from a wavelength tunable, pulsed dye laser. Electronic quenching ofBi2 A(0+u) by five collision partners (Ne, Ar, Kr, Xe, N2) was examined for four vibrational levels (v'=22,23,24,25). Electronic quenching by a sixth collision partner (He) was examined for eight vibrational levels (v'=18 through 25). The quenching from stable vibrational levels (v'≤22) was independent ofvibrational quantum number. A significant increase in quenching occurs for the predissociated level v'=23. Electronic quenching transfer rates ranged from 227.3 to 850.5x10-13 cm3 molec-1 sec-1 for v'=22 and from 741.2 to 1570x10-13 cm3 molec-1 sec-1 for v'=23, and are very nearly gas kinetic for v'=23. Electronic quenching ofhigher vibrational levels (v'>23) was not temporally resolvable by the experimental apparatus.

AFIT Designator

AFIT-GAP-ENP-01M-02

DTIC Accession Number

ADA392555

Comments

Plain-text title: Electronic Quenching of the A(0+u) State of Bi2

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