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• W2762133086 abstract "Context. Helium, the second most abundant element in the Universe, with a relative abundance of He/H ~ 1/10, has never been observed in any other form than that of a neutral atom (He) or an ion (He + ) in the interstellar medium. Since He is a noble gas its non-observation as part of neutral molecular systems is understandable, but it is very surprising for a positively charged species such as HeH + that is a stable diatomic ion whose spectral signatures are well known in the laboratory. Aims. This non-observation, even in hydrogen rich regions, could imply that HeH + is not a proper target and that alternatives have to be considered, such as small HeH n + clusters. The present study aims at finding whether the leading term HeH 3 + fulfills the conditions required. Methods. We addressed the question with state-of-the-art numerical simulations. We determined a two-dimension ab initio potential energy surface (PES) of the HeH 3 + cluster along the He...H 3 + and HeH + ...H 2 reaction coordinates. The calculations rely on complete active space configuration interaction followed by a second order perturbation treatment (CAS-PT2). This surface was used for the evaluation of the two radiative associations rate constants by means of a quantum treatment of the collision between the interacting fragments. Results. These calculations show unambiguously that HeH 3 + is the most stable point on the corresponding global PES. Then, we determined the rate constants of the radiative associations HeH + + H 2 and He + H 3 + leading to HeH 3 + . Conclusions. Significative values were obtained that reach up to 2 × 10 -18 cm 3 s -1 , which should stimulate new tentatives to detect molecular helium in astrophysical objects." @default.
• W2762133086 created "2017-10-20" @default.
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• W2762133086 date "2017-11-01" @default.
• W2762133086 modified "2023-10-16" @default.
• W2762133086 title "Search for hydrogen-helium molecular species in space" @default.
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• W2762133086 doi "https://doi.org/10.1051/0004-6361/201731441" @default.
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