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A state-selected continuous wave laser excitation method for determining CO2’s rotational state distribution in a supersonic molecular beam
Review of Scientific Instruments, Volume: 95, Issue: 5, Start page: 055111
Swansea University Author:
Helen Chadwick
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© 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercialNoDerivs 4.0 International (CC BY-NC-ND) license.
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DOI (Published version): 10.1063/5.0203641
Abstract
State-resolved experiments can provide fundamental insight into the mechanisms behind chemical reactions. Here, we describe our methods for characterizing state-resolved experiments probing the outcome of the collision between CO2 molecules and surfaces. We create a molecular beam from a supersonic...
Published in: | Review of Scientific Instruments |
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ISSN: | 0034-6748 1089-7623 |
Published: |
AIP Publishing
2024
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Online Access: |
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URI: | https://cronfa.swan.ac.uk/Record/cronfa66470 |
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Abstract: |
State-resolved experiments can provide fundamental insight into the mechanisms behind chemical reactions. Here, we describe our methods for characterizing state-resolved experiments probing the outcome of the collision between CO2 molecules and surfaces. We create a molecular beam from a supersonic expansion that passes through an ultra-high vacuum system. The CO2 is vibrationally excited by a continuous wave infrared (IR) laser using rapid adiabatic passage. We attenuate the fractional excitation using a CO2 absorption cell in the IR beam path. We combine Monte Carlo simulations and molecular beam energy measurements to find the initial rotational state distribution of the molecular beam. We find that our pure CO2 beam from a 300 K source has a rotational temperature of ∼26 K. |
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College: |
Faculty of Science and Engineering |
Funders: |
This work was part of the research program Materials for Sustainability with Project No. 739.017.008, which is (partly) financed by the Dutch Research Council (NWO). |
Issue: |
5 |
Start Page: |
055111 |