Time-resolved measurement of the C2 1Aπu state population following photodissociation of the S1 state of acetylene using frequency-modulation spectroscopy
Du, Zhenhui
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https://hdl.handle.net/2142/96990
Description
Title
Time-resolved measurement of the C2 1Aπu state population following photodissociation of the S1 state of acetylene using frequency-modulation spectroscopy
Author(s)
Du, Zhenhui
Contributor(s)
Field, Robert W.
Jiang, Jun
Issue Date
2017-06-20
Keyword(s)
Multiple potential energy surfaces
Abstract
The excited-state population of the C$_2$ $^1APi_u$ state produced in photolysis of S$_1$ acetylene was investigated. The pulsed UV laser (216.5 nm) excites acetylene into $J=8$ $e$-symmetry level of the S$_1$ $3^4$ level, and subsequently dissociates the S$_1$ acetylene into C$_2$ fragments. A frequency-modulated near-infrared probe laser beam is used to detect the C$_2$ population in the $^1APi_u$ state. The sensitivity and the fast response of the experimental setup has been verified by I$_2$ excited state measurements. The setup will be used to record the C$_2$ $A-X$ transitions, which are fitted with a Voigt function. The derived lineshape and line intensities will be analyzed, and we will use the information to calculate the $A$ state populations of C$_2$ and map the populations with time-resolution following the photolysis.
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