Laser-Stark spectrum of methyl alcohol at 890.761 GHz with the HCN laser

Johnston, L. H.; Srivastava, Rajendra P.; Lees, R. M.

doi:10.1016/0022-2852(80)90234-9

Cited by 50 publications

(5 citation statements)

References 29 publications

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“…The torsion rotation Hamiltonian of methanol molecule using an internal axis method (IAM) by Lees and Baker [21] and the effect of DC electric field effect on energy levels are described in detail by Johnston et al [22]. Since then the Hamiltonian has been refined to include higher order terms by Duan and his coworkers [23e27].…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…In this method the a-axis is the axis of internal rotation, the b-axis is in the COH plane and the c-axis is mutually perpendicular to the a-, and b-axes. The Hamiltonian of the methanol molecule in the presence of a D.C. electric field has been treated in detail elsewhere [22]. Here only the essential equations needed for the evaluation of the dipole moment components from the MW results are For the E-torsional species and the A-species levels for which the asymmetry splitting is much smaller than the Stark energy Àm.E, the overall Stark shift (DW) can in general be written as…”

Section: Theoretical Considerationsmentioning

confidence: 99%

See 1 more Smart Citation

Dipole moment of methanol by microwave stark spectroscopy IV: 13CD316OH species

Mukhopadhyay

Sastry

2015

Journal of Molecular Structure

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Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Theoretical Considerationsmentioning

confidence: 99%

Dipole moment of methanol by microwave stark spectroscopy IV: 13CD316OH species

Mukhopadhyay

Sastry

2015

Journal of Molecular Structure

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“…The application of laser Stark spectroscopy to rotational spectroscopy of methanol has been discussed in detail [54]. Equations 2 and 3 give the form of the first and second order Stark shifts, respectively.…”

Section: ) Laser Starkmentioning

confidence: 99%

“…Equations 2 and 3 give the form of the first and second order Stark shifts, respectively. In methanol, there are components of the dipole along both the a and b molecular axes so the Stark shift constants A, B, and C are linear combinations of the dipole matrix elements [54]. A and B involve the dipole matrix elements squared while C involves the dipole matrix element.…”

Section: ) Laser Starkmentioning

confidence: 99%

Instrumentation for THz Spectroscopy in the Laboratory and in Space

Pearson

Drouin

2021

IEEE J. Microw.

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Spectroscopic measurements in the millimeter, submillimeter, or THz range, with resolutions exceeding a MHz, provide for highly specific detections of gas-phase absorption and emission by atoms and molecules. Due to relatively low excitation energies involved in the transitions, multiple features are observable in most physical systems, and thus such observations dominate the scientific discovery of molecules in space and contribute significantly to remote sensing of the Earth and planetary bodies. The methods and techniques of THz spectroscopy continue to evolve as capabilities and technologies expand. In this article, we review the genesis of THz spectroscopy in both the laboratory and in space, and follow its development to date, providing background on the challenges, and context for the current developments that promise to extend both remote and in-situ gas composition sensing.

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“…Our approach was tested by comparing the Stark shifts calculated by the modified version of belgi with the results of a perturbation-like calculation using a code written by Lees and coauthors [21]. For J levels up to J = 2, the ratios of the Stark shifts obtained by these two methods are close to unity at 10 kV/cm and range from 0.7 to 1 at 50 kV/cm.…”

Section: B Stark Effect In Methanolmentioning

confidence: 99%

Prospects for high-resolution microwave spectroscopy of methanol in a Stark-deflected molecular beam

et al. 2013

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Recently, the extremely sensitive torsion-rotation transitions in methanol have been used to set a tight constraint on a possible variation of the proton-to-electron mass ratio over cosmological time scales. In order to improve this constraint, laboratory data of increased accuracy will be required. Here, we explore the possibility for performing high-resolution spectroscopy on methanol in a Starkdeflected molecular beam. We have calculated the Stark shift of the lower rotational levels in the ground torsion-vibrational state of CH 3 OH and CD 3 OH molecules, and have used this to simulate trajectories through a typical molecular beam resonance setup. Furthermore, we have determined the efficiency of non-resonant multi-photon ionization of methanol molecules using a femtosecond laser pulse. The described setup is in principle suited to measure microwave transitions in CH 3 OH at an accuracy below 10 −8 .

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Laser-Stark spectrum of methyl alcohol at 890.761 GHz with the HCN laser

Cited by 50 publications

References 29 publications

Dipole moment of methanol by microwave stark spectroscopy IV: 13CD316OH species

Dipole moment of methanol by microwave stark spectroscopy IV: 13CD316OH species

Instrumentation for THz Spectroscopy in the Laboratory and in Space

Prospects for high-resolution microwave spectroscopy of methanol in a Stark-deflected molecular beam

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