Hydrogen‐atom spectroscopy of the ionizing plasma containing molecular hydrogen: Line intensities and ionization rate

1993 ◽  
Vol 73 (12) ◽  
pp. 8122-8125 ◽  
Author(s):  
Keiji Sawada ◽  
Kouji Eriguchi ◽  
Takashi Fujimoto
Keyword(s):  
Hydrogen Atom ◽  
Molecular Hydrogen ◽  
Ionization Rate ◽  
Hydrogen Line ◽  
Line Intensities

Ratios of molecular hydrogen line intensities in shocked gas - Evidence for cooling zones

1988 ◽  
Vol 334 ◽  
pp. L103 ◽  
Author(s):  
P. W. J. L. Brand ◽  
A. Moorhouse ◽  
M. G. Burton ◽  
T. R. Geballe ◽  
M. Bird ◽  
...  
Keyword(s):  
Molecular Hydrogen ◽  
Hydrogen Line ◽  
Line Intensities

scholarly journals Atmospheric deuterium fractionation: HCHO and HCDO yields in the CH<sub>2</sub>DO+O<sub>2</sub> reaction

2007 ◽  
Vol 7 (4) ◽  
pp. 10019-10041 ◽  
Author(s):  
E. Nilsson ◽  
M. S. Johnson ◽  
F. Taketani ◽  
Y. Matsumi ◽  
M. D. Hurley ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Ftir Spectroscopy ◽  
Molecular Oxygen ◽  
Molecular Hydrogen ◽  
Branching Ratio ◽  
Hydrogen Atom Transfer ◽  
Photochemical Oxidation ◽  
Oxidation Of Methane ◽  
Methoxy Radical ◽  
Deuterium Enrichment

Abstract. The formation of formaldehyde via hydrogen atom transfer from the methoxy radical to molecular oxygen is a key step in the atmospheric photochemical oxidation of methane, and in the propagation of deuterium from methane to molecular hydrogen. We report the results of the first investigation of the branching ratio for HCHO and HCDO formation in the CH2DO+O2 reaction. Labeled methoxy radicals (CH2DO) were generated in a photochemical reactor by photolysis of CH2DONO. HCHO and HCDO concentrations were measured using FTIR spectroscopy. Significant deuterium enrichment was seen in the formaldehyde product, from which we derive a branching ratio of 88.2±1.1% for HCDO and 11.8±1.1% for HCHO. The implications of this fractionation on the propagation of deuterium in the atmosphere are discussed.

Intra- and inter-molecular hydrogen-atom abstraction of photoexcited 1,4-dimethylanthraquinone

1993 ◽  
Vol 213 (5-6) ◽  
pp. 581-585 ◽  
Author(s):  
Nakayama Toshihiro ◽  
Honma Chisako ◽  
Miki Sadao ◽  
Kumao Hamanoue
Keyword(s):  
Hydrogen Atom ◽  
Molecular Hydrogen ◽  
Hydrogen Atom Abstraction

Anomalous hydrogen line intensities in the spectrum of HD 152107

Astrophysics ◽  
1970 ◽  
Vol 4 (4) ◽  
pp. 276-278
Author(s):  
T. I. Kuznetsova
Keyword(s):  
Hydrogen Line ◽  
Line Intensities

scholarly journals High-n Hydrogen Lines in Solar Infrared Spectra from Balloon-borne, Mauna Kea, and ATMOS Observations

1994 ◽  
Vol 154 ◽  
pp. 365-370
Author(s):  
R. T. Boreiko ◽  
T. A. Clark ◽  
D. A. Naylor ◽  
J. R. Busler
Keyword(s):  
Space Shuttle ◽  
Emission Peak ◽  
Emission Lines ◽  
Hydrogen Line ◽  
Broad Absorption ◽  
Tentative Identification ◽  
Line Intensities ◽  
Hydrogen Lines ◽  
Rydberg Transitions ◽  
Absorption Features

This paper reports the observation of high-n lines in emission from n = 12-11, 13-12, 14-13 and 16-15 Rydberg transitions in H, Mg and Si in solar far IR spectra taken from balloon altitudes, in which the H I line intensities are found to exceed those from the heavier elements. Tentative identification is also made of the n = 8-7 hydrogen line in emission on 20 μm spectra taken from Mauna Kea. The characteristics of the hydrogen lines are compared with lower-n transitions seen in the Space Shuttle ATMOS spectra, in which Brackett, Pfund and n = 6 lines with Δn = 1, 2, 3 and 4 are seen as broad absorption features, while the n = 7-6 line shows a small emission peak within a broader absorption line and the n = 9-7, and possibly the 11-8, transitions appear as weak emission lines. These results indicate that the transformation from absorption to emission occurs at longer wavelengths for hydrogen lines than for those of heavier elements.

scholarly journals Interstellar Dust and the H2 Molecule

1965 ◽  
Vol 7 ◽  
pp. 259-264
Author(s):  
K. H. Schmidt
Keyword(s):  
Hydrogen Atom ◽  
Molecular Hydrogen ◽  
Interstellar Dust ◽  
Unit Volume ◽  
Formation Rate ◽  
Dust Particles ◽  
Interstellar Gas ◽  
The Past ◽  
Grain Surface ◽  
H2 Molecule

Nearly 20 Years Ago van de Hulst stated that the formation of molecular hydrogen occurs on the surfaces of the interstellar grains. (See ref. 1.) In the last years several authors discussed the problem of the interstellar abundance of the H2 molecule. (See refs. 2 to 9.) They all found that the percentage of the molecular hydrogen in the interstellar gas probably is much larger than had been thought in the past and that the essential mechanism of H2 formation is the formation on the particle surfaces. Therefore, the formation rate of interstellar H2 is a function of the area of the grain surface per unit volume, which is dependent on the average radius of the grains ā, on the number of dust particles per unit volume N(ā), and on the distribution function of the particle radii. The formation rate is determined by the density of the atomic hydrogen nH and the temperature of the interstellar gas Tgas. Finally, the formation rate of H2 depends on the probability π that an impinging hydrogen atom on a grain joins with another hydrogen atom to form a molecule.

scholarly journals Spectropolarimetry of the molecular hydrogen line emission from OMC-1

1988 ◽  
Vol 235 (1) ◽  
pp. 161-174 ◽  
Author(s):  
M. G. Burton ◽  
J. H. Hough ◽  
D. J. Axon ◽  
T. Hasegawa ◽  
M. Tamura ◽  
...  
Keyword(s):  
Molecular Hydrogen ◽  
Line Emission ◽  
Hydrogen Line

scholarly journals Extracting the Ionization Rate From Photoelectron Momentum Distribution Induced by Circularly Polarized Laser Pulse

10.29007/62hv ◽  
2020 ◽  
Author(s):  
Nguyen Thanh Vinh Pham ◽  
Oleg I. Tolstikhin ◽  
Toru Morishita
Keyword(s):  
Laser Pulse ◽  
Momentum Distribution ◽  
Laser Field ◽  
Molecular Hydrogen ◽  
Molecular System ◽  
Ionization Rate ◽  
Transverse Plane ◽  
Hydrogen Ion ◽  
Circularly Polarized ◽  
Adiabatic Theory

In this paper, the adiabatic theory is implemented to consider the ionization process of molecular system exposed to circularly polarized laser pulse. The photoelectron momentum distribution exhibits strong evidence of the properties of the molecular orbital. We also present the possibility to retrieve the ionization rate of the ionized electron from photoelectron momentum distribution in the transverse plane respecting to the polarized plane of the laser field. These results are vital in the viewpoint of the experiment. Several states of molecular hydrogen ion are considered for illustration.

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