Hamiltonian description and 6D calculations on the ammonia vibrational levels

Rashev, S.; Moule, D. C.

doi:10.1016/j.jms.2005.10.007

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Inversion Doubling Overtones and Combinations1

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“…Using the data from Table 2 of Ref. [23] and Table 3 of Ref. [22], a total of 17 vibrational excitations are included, namely: ν 2 (+ and −), 2ν 2 (+ and −), 3ν 2 (+ and −), 4ν 2 (+ and −), ν 4 , ν 2 + ν 4 (+ and −), 2ν 4 (A 1 ), 2ν 4 (E), ν 1 , ν 3 , and 2ν 2 + ν 4 (+ and −).…”

Section: Inversion Doubling Overtones and Combinationsmentioning

confidence: 99%

Resonant positron annihilation in ammonia

Gribakin

2010

J. Phys.: Conf. Ser.

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Abstract. Positron annihilation in ammonia is analyzed using the framework of resonant annihilation [G. F. Gribakin and C. M. R. Lee, Phys. Rev. Lett. 97, 193201 (2006)]. In particular, we show that molecular rotations can have a measurable effect on the annihilation rates at room temperatures. Rotation leads to broadening of vibrational Feshbach resonances. Rotations also allow a distinct contribution at low positron energies in the form of a rotational Feshbach resonance. This resonance can enhance the annihilation rate for thermalized roomtemperature positrons. Comparison of theory and experiment shows that overtone and combination vibrations, including those due to inversion doubling, likely play an important role.

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Section: Inversion Doubling Overtones and Combinationsmentioning

confidence: 99%