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 Copy

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

6/20/2017

Keyword(s)

Mini-symposium: 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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/96990

DOI

10.15278/isms.2017.TB02

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