Astrophysical detection of the helium hydride ion HeH+
نویسندگان
چکیده
منابع مشابه
Version 2.0 Rovibrational levels of helium hydride ion
Dissociation energy (D0) of rovibrational levels of 4HeH+ has been predicted theoretically to the accuracy of the order of 0.01 cm−1. The calculations take into account adiabatic and nonadiabatic corrections as well as relativistic and QED effects. For the ground rovibrational level D0 = 14 874.213(10) cm−1 and it differs by several tens of the inverse centimeter from previous theoretical estim...
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HeH is found to be the dominant positive ion over a wide range of temperatures and densities relevant to helium-rich white dwarfs. The inclusion of HeH in ionization equilibrium computations increases the abundance of free electrons by a significant factor. For temperatures below 8000 K, He free-free absorption is increased by up to a factor of 5 by the inclusion of HeH . Illustrative model atm...
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R-matrix calculations combined with the adiabatic nuclei approximation are used to compute electron-impact rotational excitation rates for three closed-shell diatomic cations, HeH+, CH+, ArH+. Comparisonswith previous studies show that an improved treatment of threshold effects leads to significant changes in the low temperature rates; furthermore the new calculations suggest that excitation of...
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The hydrohelium cation, HeH(+), serves as an important benchmark for ab initio calculations that take into account non-adiabatic, relativistic, and quantum electrodynamic effects. Such calculations are capable of predicting molecular transitions to an accuracy of ~300 MHz or less. However, in order to continue to push the boundaries on these calculations, new measurements of these transitions a...
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ژورنال
عنوان ژورنال: Nature
سال: 2019
ISSN: 0028-0836,1476-4687
DOI: 10.1038/s41586-019-1090-x