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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation
Published on: October 30, 2012
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Vacuum-ultraviolet frequency-modulation spectroscopy
U Hollenstein1, H Schmutz1, J A Agner1
1Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
The Journal of Chemical Physics
|January 9, 2017
Summary
Frequency-modulation (FM) spectroscopy now reaches the vacuum-ultraviolet (VUV) range. This new VUV FM technique offers background-free measurements for atomic and molecular spectra.
Area of Science:
- Atomic and Molecular Spectroscopy
- Laser Physics
- Quantum Optics
Background:
- Frequency-modulation (FM) spectroscopy is a powerful technique for high-resolution spectroscopy.
- Extending FM spectroscopy to the vacuum-ultraviolet (VUV) spectral region presents significant challenges due to the lack of suitable coherent VUV sources.
Purpose of the Study:
- To develop and demonstrate a novel method for performing frequency-modulation spectroscopy in the vacuum-ultraviolet (VUV) spectral range.
- To showcase the advantages of VUV FM spectroscopy, including its background-free nature and applicability to cold samples.
Main Methods:
- Generation of coherent VUV laser radiation via resonance-enhanced sum-frequency mixing (2νUV + ν2) in Krypton (Kr) and Xenon (Xe).
- Utilizing sidebands generated by an electro-optical modulator on one of the laser sources (ν2) for VUV FM spectroscopy.
- Recording VUV FM spectra with demodulation at νmod and 2νmod.
Main Results:
- Successful extension of frequency-modulation spectroscopy into the vacuum-ultraviolet (VUV) spectral region.
- Demonstration of background-free VUV absorption spectra acquisition for Ar, Kr, and N2.
- Simultaneous recording of VUV FM, laser-induced fluorescence, and photoionization spectra from cold samples in supersonic beams.
Conclusions:
- The developed VUV FM spectroscopy technique is a versatile and advantageous tool for studying atomic and molecular species.
- The method's implementation with table-top laser equipment makes it accessible for various spectroscopic investigations.
- This technique opens new avenues for high-resolution VUV spectroscopy of cold molecular beams.
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