High-resolution Microsecond-time-resolved Dual-comb Spectroscopy Of Transient Intermediates

Luo, Pei-Ling

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https://hdl.handle.net/2142/111453 Copy

Description

Title

High-resolution Microsecond-time-resolved Dual-comb Spectroscopy Of Transient Intermediates

Author(s)

Luo, Pei-Ling

Issue Date

2021-06-22

Keyword(s)

Instrument/Technique Demonstration

Date of Ingest

• 2021-09-24T21:09:47Z
• 2022-01-21T16:09:05Z

Abstract

We demonstrated high-resolution microsecond-time-resolved dual-comb spectroscopy of an important short-lived molecule, the simplest Criegee intermediate (\chem{CH_2OO}). A dual-comb spectrometer with central wavelength near 8 $\mu$m was built by means of single-pass difference frequency generation between a near-infrared dual-comb source and a continuous-wave Tm-doped laser in an OP-GaP crystal\footnote{Ref: Opt. Lett., 45, 6791 (2020)}. By coupling the 8-$\mu$m dual-comb source into a multipass cell, the time-dependent absorption signals of \chem{CH_2OO} and its reaction product (formaldehyde) can be simultaneously obtained upon 248-nm photolysis of the flowing mixtures of \chem{CH_2I_2}/\chem{O_2}. Furthermore, the pressure broadened spectra of \chem{CH_2OO} were measured by employing spectrally interleaved dual-comb spectroscopy to derive the collisional broadening coefficient.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Genre of Resource

Conference Paper / Presentation

Language

eng

Permalink

http://hdl.handle.net/2142/111453

DOI

10.15278/isms.2021.TB02

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