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Far-Infrared Laser Assignments for Methylamine

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Abstract

Reported far-infrared laser lines for five different transition systems of CH3NH2 optically pumped by a CO2 laser have been identified spectroscopically through a high-resolution Fourier transform infrared study of the C-N stretching band together with CO2-laser/microwave-sideband broad-scan and Lamb-dip measurements. From the infrared analysis plus previous far-infrared (FIR) results for the ground vibrational state, quantum numbers have been assigned for seven methylamine FIR laser transitions and their C-N stretching pump absorptions coincident with the CO2 laser lines. The assignments are confirmed through the use of closed frequency combination loops that also provide improved FIR laser frequencies to spectroscopic accuracy.

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Acknowledgements

This research was financially supported by the Natural Sciences and Engineering Research Council of Canada. We express our gratitude to Dr. J.W.C. Johns for his help and hospitality during the recording of the methylamine FTIR spectrum at NRC in Ottawa. We thank Prof. N. Ohashi for kindly providing a table of accurate ground-state energies for CH3NH2.

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  1. Department of Physics, Centre for Laser, Atomic and Molecular Sciences (CLAMS), University of New Brunswick, Saint John, N.B., Canada, E2L 4L5

    R. M. Lees, Zhen-Dong Sun & Li-Hong Xu

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  1. R. M. Lees
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  2. Zhen-Dong Sun
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  3. Li-Hong Xu
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Correspondence to R. M. Lees.

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Lees, R.M., Sun, ZD. & Xu, LH. Far-Infrared Laser Assignments for Methylamine. Int J Infrared Milli Waves 29, 148–156 (2008). https://doi.org/10.1007/s10762-007-9309-6

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  • DOI: https://doi.org/10.1007/s10762-007-9309-6

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