Preparation of High Vibrational States in the Entire Molecular Beam

Preparing highly excited molecules is of great interest in chemistry, but it has long been a challenge due to the high laser power required within the narrow line width to excite a weak transition. We present a cavity-enhanced infrared excitation scheme using a milliwatt laser. As a demonstration, about 35% of CO molecules in a ground-state rotational level were excited to the highly excited <i>v</i> = 3 state in the entire pulsed supersonic beam, as confirmed by the depletion of molecules in the ground state. The method was also applied to excite HD molecules to the <i>v</i> = 2 state with a continuous-wave diode laser. This work provides a universal approach to prepare molecules in a specific quantum state, paving the way to study the chemical reaction dynamics of highly excited molecules.

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Publication Details

Journal
The Journal of Physical Chemistry Letters
Published
2024-09-20
DOI
https://doi.org/10.1021/acs.jpclett.4c02396
Citations
5
Primary Topic
Spectroscopy and Laser Applications
Type
article
Field-Weighted Citation Impact
1.20

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Preparation of High Vibrational States in the Entire Molecular Beam

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Preparation of High Vibrational States in the Entire Molecular Beam

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article en
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Abstract

Preparing highly excited molecules is of great interest in chemistry, but it has long been a challenge due to the high laser power required within the narrow line width to excite a weak transition. We present a cavity-enhanced infrared excitation scheme using a milliwatt laser. As a demonstration, about 35% of CO molecules in a ground-state rotational level were excited to the highly excited <i>v</i> = 3 state in the entire pulsed supersonic beam, as confirmed by the depletion of molecules in the ground state. The method was also applied to excite HD molecules to the <i>v</i> = 2 state with a continuous-wave diode laser. This work provides a universal approach to prepare molecules in a specific quantum state, paving the way to study the chemical reaction dynamics of highly excited molecules.

The Journal of Physical Chemistry LettersVol. 15(39)
University of Science and Technology of China (CN), Dalian Institute of Chemical Physics (CN), Southern University of Science and Technology (CN), Hefei National Center for Physical Sciences at Nanoscale (CN), Institute of Advanced Light Source Facilities Shenzhen (CN), State Key Laboratory of Molecular Reaction Dynamics
National Natural Science Foundation of China, Chinese Academy of Sciences, Science, Technology and Innovation Commission of Shenzhen Municipality, Guangdong Province Introduction of Innovative R&D Team
Openalex Percentile: Top 23%
Spectroscopy and Laser Applications
1.20
DOISourceOpenAlex
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