Optics
Effective production of Xe$_2$I excimer molecules by high-energy charged particles in Xe containing a small amount of C$_3$F$_7$I
A. I. Mis'kevich National Engineering Physics Institute "MEPhI", Moscow
Abstract:
An anomalously high efficiency of generating Xe
$_2$I
$^*$ excimer molecules in dense Xe–C
$_3$F
$_7$I gaseous mixtures with a small amount of C
$_3$F
$_7$I that are excited by a pulsed beam of fast electrons is discovered. The electron energy is 150 keV, and the beam current amplitude and duration are, respectively, 5 A and 5 ns. The temporalspectral characteristics of spontaneous radiation from ŐćI
$^*$ and Xe
$_2$I
$^*$ excimer molecules are measured. Also, the luminescence times of the upper level for the
B–
X transition in the ŐćI
$^*$ molecule (
$\lambda_{\mathrm{max}}$ = 253 nm) and the upper level for the
$4^2\Gamma-1^2\Gamma$ transition in the Xe
$_2$I
$^*$ molecule (
$\lambda$ = 352 nm), as well as the rate constants of quenching these levels by the gaseous mixture components, are determined. Based on the characteristics of the track structure of a high-energy plasma produced by charged particles in the dense gaseous medium, a model of plasma-chemical processes leading to the formation of Xe
$_2$I
$^*$ (
$\lambda_{\mathrm{max}}$ = 253 nm) and Xe
$_2$I
$^*$ (
$\lambda$ = 352 nm) excimer molecules in a Xe–C
$_3$F
$_7$I mixture with a small amount of an iodine atom donor is suggested.
Received: 20.11.2014
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