Collision lifetimes of polyatomic molecules at low temperatures: Benzene–benzene vs benzene–rare gas atom collisions

2014 ◽  
Vol 141 (16) ◽  
pp. 164315 ◽  
Author(s):  
Jie Cui ◽  
Zhiying Li ◽  
Roman V. Krems
Keyword(s):  
Low Temperatures ◽  
Polyatomic Molecules ◽  
Rare Gas

scholarly journals Complexes with Atomic Gold Ions: Efficient Bis-Ligand Formation

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3484
Author(s):  
Felix Duensing ◽  
Elisabeth Gruber ◽  
Paul Martini ◽  
Marcelo Goulart ◽  
Michael Gatchell ◽  
...  
Keyword(s):  
Polyatomic Molecules ◽  
Rare Gas ◽  
Abundance Distribution ◽  
Degree Of Ionization ◽  
Covalent Bonds ◽  
Helium Nanodroplets ◽  
Order Of Magnitude ◽  
High Resolution Mass Spectrometer ◽  
Dumbbell Structure ◽  
Resolution Mass

Complexes of atomic gold with a variety of ligands have been formed by passing helium nanodroplets (HNDs) through two pickup cells containing gold vapor and the vapor of another dopant, namely a rare gas, a diatomic molecule (H2, N2, O2, I2, P2), or various polyatomic molecules (H2O, CO2, SF6, C6H6, adamantane, imidazole, dicyclopentadiene, and fullerene). The doped HNDs were irradiated by electrons; ensuing cations were identified in a high-resolution mass spectrometer. Anions were detected for benzene, dicyclopentadiene, and fullerene. For most ligands L, the abundance distribution of AuLn+ versus size n displays a remarkable enhancement at n = 2. The propensity towards bis-ligand formation is attributed to the formation of covalent bonds in Au+L2 which adopt a dumbbell structure, L-Au+-L, as previously found for L = Xe and C60. Another interesting observation is the effect of gold on the degree of ionization-induced intramolecular fragmentation. For most systems gold enhances the fragmentation, i.e., intramolecular fragmentation in AuLn+ is larger than in pure Ln+. Hydrogen, on the other hand, behaves differently, as intramolecular fragmentation in Au(H2)n+ is weaker than in pure (H2)n+ by an order of magnitude.

Interference effects in the spectrum of HD: II. The fundamental band for HD–rare gas mixtures

1984 ◽  
Vol 62 (12) ◽  
pp. 1665-1672 ◽  
Author(s):  
A. R. W. McKellar ◽  
N. H. Rich
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Low Temperatures ◽  
Rare Gas ◽  
Interference Effects ◽  
Rare Gases ◽  
Physical Processes ◽  
Fundamental Band ◽  
Line Shapes ◽  
Collision Partner

The absorption spectrum of the fundamental band of HD (λ ≈ 2.7 μm) has been studied at high resolution in mixtures with the rare gases He, Ne, and Ar at low temperatures (77 and 145 K) and moderate densities (<205 amagat). Interference effects that occur between the collision-induced transitions and the dipole-allowed transitions of free HD were analyzed as a function of density and collision-partner. The R(0) and R(1)dipole transitions exhibited large changes in shape and intensity at high densities, but their behaviours were quite different from each other. Like the pure HD samples, the line shapes were well represented by series of Fano profiles, and the density dependences of the lines were well explained by the theory of Herman, Tipping, and Poll. These results should greatly improve the understanding of the physical processes underlying the interference effects.

Free radicals formed by reaction of silane with hydrogen atoms in rare gas matrices at very low temperatures

1985 ◽  
Vol 83 (9) ◽  
pp. 4504-4510 ◽  
Author(s):  
K. Nakamura ◽  
N. Masaki ◽  
S. Sato ◽  
K. Shimokoshi
Keyword(s):  
Free Radicals ◽  
Low Temperatures ◽  
Rare Gas ◽  
Hydrogen Atoms

scholarly journals HCN and C2H2 in carbon stars

1984 ◽  
Vol 105 ◽  
pp. 199-201
Author(s):  
K. Eriksson ◽  
B. Gustafsson ◽  
U. G. J⊘rgensen ◽  
Å. Nordlund
Keyword(s):  
Low Temperatures ◽  
Carbon Star ◽  
Polyatomic Molecules ◽  
Carbon Stars ◽  
Temperature Range

At the low temperatures of cool carbon star atmospheres polyatomic molecules form. Most abundant of these for the temperature range 2500–3000 are HCN and C2H2 (Fig. 1).

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