US EPA

6586836 

Journal Article 

ArF laser excitation, collisional transfer, and quench-free fluorescence in I-2/foreign gas mixtures 

Exton, RJ; Balla, RJ; , 

2004 

1 

Journal of Quantitative Spectroscopy and Radiative Transfer
ISSN: 0022-4073
EISSN: 1879-1352 

PERGAMON-ELSEVIER SCIENCE LTD 

OXFORD 

86 

3 

267-283 

10.1016/j.jqsrt.2003.08.006 

WOS:000221421100003 

Fluorescence of I? excited by an ArF excimer laser at 193 nm has been studied in the presence of 10 buffer gases (He, Ne, Ar, Kr, Xe, N-2, O-2, air, CF4, and SF6) over the pressure range from 0 to 700 Torr. At low pressure, the fluorescence is dominated by the bound-bound and bound-free (McLennan band) emission for D(1)Z(u)(divided by) --> X(1)Sigma(g)(divided by). With increasing pressure, significant fractions of the D state population are collisionally transferred to the D' state; this results in strong D'(3) Pi(2g) --> A'(3) Pi(2u) band flourescence at 340 nm. A simple four-level model is developed to describe these processes. Quenching and transfer rate coefficients are measured for the 10 gases. With the exception of Xe, O-2, and air, which exhibit reactive quenching in addition to collisional quenching, the 340-nm-band fluorescence is resistant to quenching. Published by Elsevier Ltd. 

fluorescence; iodine; rate coefficients; quenching