A Molecular Candle Where Few Molecules Shine: HeHHe+

Autor: Ben Khalifa, M., Quintas-Sánchez, E., Dawes, R., Hammami, K., Fortenberry, Ryan, Wiesenfeld, Laurent
Přispěvatelé: Laboratoire Aimé Cotton (LAC), CNRS-Université de Paris-Sud
Rok vydání: 2020
Předmět:
Extraterrestrial Environment
Infrared
media_common.quotation_subject
Pharmaceutical Science
Infrared spectroscopy
Astrophysics::Cosmology and Extragalactic Astrophysics
Helium
Vibration
01 natural sciences
Molecular physics
Quantum chemistry
Article
Analytical Chemistry
quantum chemistry
lcsh:QD241-441
Isotopes
lcsh:Organic chemistry
Spectroscopy
Fourier Transform Infrared
0103 physical sciences
Drug Discovery
Molecule
Physical and Theoretical Chemistry
Triplet state
infrared spectroscopy
010303 astronomy & astrophysics
ComputingMilieux_MISCELLANEOUS
media_common
Physics
Photons
010304 chemical physics
helium chemistry
Organic Chemistry
Observable
Hydrogen atom
early universe
Universe
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
[PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA]
TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES
Chemistry (miscellaneous)
Quantum Theory
Molecular Medicine
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Software
Hydrogen
Zdroj: Molecules, Vol 25, Iss 2183, p 2183 (2020)
Molecules
Molecules, MDPI, 2020, 25 (9), pp.2183. ⟨10.3390/molecules25092183⟩
Volume 25
Issue 9
ISSN: 1420-3049
DOI: 10.3390/molecules25092183
Popis: HeHHe + is the only potential molecule comprised of atoms present in the early universe that is also easily observable in the infrared. This molecule has been known to exist in mass spectrometry experiments for nearly half-a-century and is likely present, but as-of-yet unconfirmed, in cold plasmas. There can exist only a handful of plausible primordial molecules in the epochs before metals (elements with nuclei heavier than 4 He as astronomers call them) were synthesized in the universe, and most of these are both rotationally and vibrationally dark. The current work brings HeHHe + into the discussion as a possible (and potentially only) molecular candle for probing high-z and any metal-deprived regions due to its exceptionally bright infrared feature previously predicted to lie at 7.43 &mu
m. Furthermore, the present study provides new insights into its possible formation mechanisms as well as marked stability, along with the decisive role of anharmonic zero-point energies. A new entrance pathway is proposed through the triplet state ( 3 B 1 ) of the He 2 H + molecule complexed with a hydrogen atom and a subsequent 10.90 eV charge transfer/photon emission into the linear and vibrationally-bright 1 &Sigma
g + HeHHe + form.
Databáze: OpenAIRE
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