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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

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Published on: October 30, 2012

Multipass cell for molecular beam absorption spectroscopy.

D Kaur, A M de Souza, J Wanna

|June 18, 2010

Summary

This summary is machine-generated.

A novel two-spherical mirror multipass cell enables efficient laser coupling for molecular spectroscopy. This setup achieved sub-Doppler linewidths for jet-cooled hydrocarbons, advancing high-resolution molecular beam studies.

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Area of Science:

Molecular Spectroscopy
Laser Physics
Physical Chemistry

Background:

High-resolution molecular spectroscopy requires efficient interaction between laser light and molecular samples.
Multipass cells enhance interaction path length but often face challenges in coupling laser beams to molecular beams.

Purpose of the Study:

To develop and characterize a novel two-spherical mirror multipass cell for improved laser coupling.
To apply the cell for high-resolution direct absorption spectroscopy of small hydrocarbons.

Main Methods:

Design and implementation of a two-spherical mirror multipass cell with near-concentric alignment.
Coupling a laser beam into and out of the cell at the edges of opposite mirrors.
Direct absorption spectroscopy of jet-cooled acetylene, propyne, and 1-butyne in the 3-micrometer region.

Main Results:

Observed an approximately parabolic reflection pattern, indicating efficient beam management within the cell.
Achieved forty to fifty passes of the laser beam through the molecular beam.
Recorded sub-Doppler linewidths as narrow as 12 MHz for the studied hydrocarbons.

Conclusions:

The developed two-spherical mirror multipass cell effectively couples laser beams to collimated molecular beams.
The cell facilitates high-resolution, sub-Doppler direct absorption spectroscopy of jet-cooled molecules.
This technique offers a significant advancement for precise molecular structure and dynamics studies.