Vibrational Energy Transfer within the B³π(0⁺_u) State of ⁷⁹Br₂ upon Collision with N₂, O₂, NO, and SF₆

Author

Gregory S. Williams

Date of Award

12-1993

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Engineering Physics

First Advisor

Glen P. Perram, PhD

Abstract

Vibrational transfer and electronic quenching in the lower vibrational levels of the ⁷⁹Br₂(B; v'≤3) were investigated using spectrally resolved, temporally resolved pulsed laser induced fluorescence techniques. Spectrally resolved emissions from collisionally populated Br₂(B) vibrational levels were observed for N₂, O₂, NO, and SF₆collision partners. The vibrational transfer was efficient in the nonpredissociative vibrational levels and is adequately described by the Montroll-Shuler model. An average fundamental vibrational transfer rate coefficient of k_v(l,0)=3.4(±0.6) x 10^-11 cm³/molec-sec predicts the vibrational transfer rates for the 0≤v'≤3 collisions with N₂, and a rate of k_v(l,0)=2.9(±0.6) x 10^-11 cm³/molec-sec for collisions with 0₂. Vibrational rates for NO and SF₆ range from 1.5(±0.2) x 10-11cm, /molec-sec to 4.0(±1.1) x 10^-11 cm³/molec-sec. Electronic quenching rates for the observed vibrational levels were determined from the same data. Quenching rates were seen to be vibrationally dependent and went from a low of k_q=0.4(±0.1)x10^-11 cm³/molec-sec for N₂ (pump v'=2 , view v'=l) to a high of k_q=6.9(±1.1) x 10^-11 cm³/molec-sec for NO (pump v'=3, view v'=2).

AFIT Designator

AFIT-GAP-ENP-93D-10

DTIC Accession Number

ADA273905

Comments

The author's Vita page is omitted.

Recommended Citation

Williams, Gregory S., "Vibrational Energy Transfer within the B³π(0⁺_u) State of ⁷⁹Br₂ upon Collision with N₂, O₂, NO, and SF₆" (1993). Theses and Dissertations. 6648.
https://scholar.afit.edu/etd/6648