OBSERVATION OF LEVEL-SPECIFIC PREDISSOCIATION RATES IN S1 ACETYLENE

Saladrigas, Catherine A.

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https://hdl.handle.net/2142/79181 Copy

Description

Title

OBSERVATION OF LEVEL-SPECIFIC PREDISSOCIATION RATES IN S1 ACETYLENE

Author(s)

Saladrigas, Catherine A.

Contributor(s)

• Field, Robert W.
• Jiang, Jun

Issue Date

26-Jun-15

Keyword(s)

Small molecules

Abstract

A new spectroscopic scheme was used to gain insight into the predissociation mechanisms of the S$_1$ electronic state of acetylene in the 47000-47300 cm$^{-1}$ region. To study this mechanism, H-atom action spectra of predissociative S$_1$ were recorded. Instead of detecting H-atom via REMPI, an H-atom fluorescence scheme was developed, in which the H-atom was excited to 3s and 3d levels and the fluorescence was detected. The signal-to-noise ratio of H-atom fluorescence-detected action spectra is superior to REMPI detected H-atom spectra. By comparing the LIF and H-atom spectra, there is direct evidence of level-dependent predissociation rates. Some of the line-widths observed in the H-atom spectra are broader than in the LIF spectra, confirming the triplet-mediated nature of S$_1$ acetylene.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79181

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