High-resolution Microsecond-time-resolved Dual-comb Spectroscopy Of Transient Intermediates
Luo, Pei-Ling
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https://hdl.handle.net/2142/111453
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
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.
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