�ber ein neues Bandenspektrum von Aluminiumhydrid

Holst, Wayne A.

doi:10.1007/bf01340732

Cited by 22 publications

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“…It is over 100 years since the spectrum of AlH was first reported 20 in a study on an electric arc in the presence of molecular hydrogen. The visible spectrum 21,22 was later studied extensively by Holst, [23][24][25] who identified the transition as 1 P ' 1 S + and by Zeeman and Ritter. 26 Ram and Bernath 27 have recently reported a high resolution FT emission study of the correctly assigned A 1 P -X 1 S + transition.…”

Section: Previous Work (A) Alh Radicalmentioning

confidence: 99%

Electronic states and spin-forbidden cooling transitions of AlH and AlF

Wells

Lane

2011

Phys. Chem. Chem. Phys.

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The feasibility of laser cooling AlH and AlF is investigated using ab initio quantum chemistry. All the electronic states corresponding to the ground and lowest two excited states of the Al atom are calculated using multi-reference configuration interaction (MRCI) and the large AV6Z basis set for AlH. The smaller AVQZ basis set is used to calculate the valence electronic states of AlF. Theoretical Franck-Condon factors are determined for the A(1)Π→ X(1)Σ(+) transitions in both radicals and found to agree with the highly diagonal factors found experimentally, suggesting computational chemistry is an effective method for screening suitable laser cooling candidates. AlH does not appear to have a transition quite as diagonal as that in SrF (which has been laser cooled) but the A(1)Π→ X(1)Σ(+) transition transition of AlF is a strong candidate for cooling with just a single laser, though the cooling frequency is deep in the UV. Furthermore, the a(3)Π→ X(1)Σ(+) transitions are also strongly diagonal and in AlF is a practical method for obtaining very low final temperatures around 3 μK.

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