Publication Date:
2015-10-14
Description:
The mass sensitivity of the vibration–rotation–inversion transitions of H 3 16 O + , H 3 18 O + , and D 3 16 O + is investigated variationally using the nuclear motion program trove (Yurchenko, Thiel & Jensen). The calculations utilize new high-level ab initio potential energy and dipole moment surfaces. Along with the mass dependence, frequency data and Einstein A coefficients are computed for all transitions probed. Particular attention is paid to the | k | = 3 and | k – l | = 3 transitions comprising the accidentally coinciding | J, K = 0, v 2 = 0 + 〉 and | J, K = 3, v 2 = 0 – 〉 rotation–inversion energy levels. The newly computed probes exhibit sensitivities comparable to their ammonia and methanol counterparts, thus demonstrating their potential for testing the cosmological stability of the proton-to-electron mass ratio. The theoretical trove results are in close agreement with sensitivities obtained using the non-rigid and rigid inverter approximate models, confirming that the ab initio theory used in the present study is adequate.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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