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Title:High Sensitivity Broadband Transient Absorption Spectroscopy Of Molecular Beams
Author(s):Silfies, Myles C
Contributor(s):Allison, Thomas K; Lewis, Neomi; Kowzan, Grzegorz
Subject(s):Dynamics and kinetics
Abstract:Molecules with ultrafast dynamics inherently have broad spectral features and modeling ultrafast spectroscopy data is a complex art. The complexity is reduced in the gas phase, however most ultrafast spectroscopies are limited to high-density samples such as liquids. By using a frequency comb laser and optical cavities, we present a technique for performing ultrafast optical spectroscopy with high sensitivity, enabling work in dilute gas-phase molecules and clusters\footnote{M. A. R. Reber, Y. Chen, T. K. Allison, Optica 3, 311 (2016)}. This sensitivity enables ultrafast spectroscopy in dilute molecular beams, where cold isolated designer molecules, radicals, and clusters can be produced that do not exist in solution. This new technique enables direct comparisons to well-established ultrafast techniques which can provide additional insight for theoretical models and molecular dynamics. In this talk we will introduce our broadband cavity-enhanced \begin{wrapfigure}{r}{0pt}\includegraphics[scale=0.5]{HAN_isms.eps}\end{wrapfigure} transient absorption spectrometer\footnote{M. C. Silfies, G. Kowzan, N. Lewis, and T. K. Allison, arXiv:2102.04981 (2021)}, which has a UV pump at 355 nm and a probe tunable from 450 to 700 nm, and discuss measurements of chemical dynamics of molecules in seeded molecular beams. Example systems discussed will include proton transfer in 1’-hydroxy 2’-acetonapthone and the effects of argon clustering on the internal conversion of salicylidene aniline.
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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