Experimental study of the triatomic hydrogen molecule through the collisional sequence<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow

Gaillard, M.J.; Pinho, A. G. de; Poizat, J.C.; Remillieux, J.; Saoudi, Rachida

doi:10.1103/physreva.28.1267

Cited by 32 publications

(5 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…was assumed to be correct, and the lifetime of the metastable intermediate state was adjusted in order to fit the experimental spatial distribution of the H profile similar in width to the observed one, the nearly Gaussian shape of the experimental profile was not reproduced. Otherwise, as was demonstrated by Gaillard et al [7], this molecule possesses long-lived states of~~0.3 ps, a time long enough to carry it into the analyzing magnet and to invalidate the experiment. The cross section for its formation has been measured by these authors for projectile energies between 250 and 500 keV/amu.…”

Section: Experimental Apparatusmentioning

confidence: 92%

“…Behind the gas target the incident beam and the reaction products passed through a magnetic analyzer, which The coincident measurement, when combined with the fact that, at the present high-projectile velocity, the probability for H3+ to capture an electron is exceedingly small [7], provides a strong assurance that the observed fragments truly originate from the three-body breakup reaction considered here. The velocity distributions obtained in this way allow one to draw information about the angle of correlation 8&2 and the total kinetic energy 8' in the asymptotic region.…”

Section: Experimental Apparatusmentioning

confidence: 97%

See 1 more Smart Citation

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H
Faria
¹
,
Wolff
²
,
Coelho
³

et al. 1992
Phys. Rev. A
10
1
5
0
View full text Add to dashboard Cite

We have measured the energy distributions of the H+ and the H ions resulting from the collisional dissociation H3+~2H++H in argon at a projectile energy of 2700 keV. The fragment ions were separated by an analyzing magnet and detected by silicon surface barrier detectors, with the H+ and the H ions being detected in coincidence. The energy distributions of the fragments in the projectile center-of-mass frame were extracted from their transverse spatial distributions observed at a position 150 cm downstream from the collision chamber. These distributions were used subsequently to determine the total kinetic energy of the fragments and the correlation angle 0» between the H+ momenta. A comparison is carried out with recently published data obtained in the low-velocity regime in helium.

show abstract

Section: Experimental Apparatusmentioning

confidence: 92%

Section: Experimental Apparatusmentioning

confidence: 97%

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H
Faria
¹
,
Wolff
²
,
Coelho
³

et al. 1992
Phys. Rev. A
10
1
5
0
View full text Add to dashboard Cite

show abstract

“…7 The corresponding bands are expected in the wavelength range between 4000 and 5000 A. In the hollow-cathode discharge this spectral region is heavily distorted by D 2 emission lines.…”

Section: Magnetic Deflectionmentioning

confidence: 95%

Spectroscopy of Triatomic Hydrogen Molecules in a Beam

et al. 1984

View full text Add to dashboard Cite

The formation of beams of triatomic deuterium D3 and the mixed isotopic molecule D2H was optically observed for the first time when the corresponding ions were neutralized by charge exchange. The molecules were detected via the transitions between the Rydberg states n = 3 and n = 2. An assignment of the D 2 H spectrum is given. The total lifetimes of rotational sublevels of different electronic states with n = 3 of D3 were measured from the radiative decay of molecules along their path behind the charge-exchange region. Agreement with theory is satisfactory.

show abstract

“…The corresponding equations were then coupled with the equations for the ionization balance for the atomic gas. The H 3 molecule is not included due to its short lifetime (∼ 10 −7 s; Gaillard et al 1983;Bordas, Cosby, & Helm 1990). The thermal balance was solved for the atoms and atomic ions; the effect due to H − , H 2 , H + 2 , and H + 3 on the thermal balance is not taken into account.…”

Section: Modelsmentioning

confidence: 99%

Molecular Hydrogen in the Ionized Region of Planetary Nebulae

Aleman

Gruenwald

2004

ApJ

View full text Add to dashboard Cite

This paper presents an analysis of the concentration of the hydrogen molecule inside the ionized region of planetary nebulae. The equations corresponding to the ionization and chemical equilibria of H, H+, H-, H2, H2+, and H3+ are coupled with the equations of ionization and thermal balance for a photoionized atomic gas. Forty different reactions related to the formation or the destruction of these species are included. The presence of dust is taken into account, since grains act as catalysts for the production of H2, as well as shield the molecules against the stellar ionizing radiation. We analyze the effect of the stellar ionizing continuum, as well as of the gas and grain properties on the calculated H2 mass. It is shown that a significant concentration of H2 can survive inside the ionized region of planetary nebulae, mostly in the inner region of the recombination zone. The total H2 to total hydrogen mass ratio inside the ionized region increases with the central star temperature, and, depending on the PN physical conditions, it can be of the order of 10^-6 or even higher. The increase of the recombination zone with the stellar temperature can account for such correlation. This can explain why the H2 emission is more frequently observed in bipolar planetary nebulae (Gatley's rule), since this kind of object has typically hotter stars. Applying our results for the planetary nebula NGC 6720, we obtain an H2 to hydrogen mass ratio similar to the value obtained from the observed H2 line emission.Comment: 13 pages, 4 figures. Accepted for publication in Ap

show abstract

Experimental study of the triatomic hydrogen molecule through the collisional sequenceH3+→H

Cited by 32 publications

References 30 publications

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H
Faria
¹
,
Wolff
²
,
Coelho
³

et al. 1992
Phys. Rev. A
10
1
5
0
View full text Add to dashboard Cite

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H
Faria
¹
,
Wolff
²
,
Coelho
³

et al. 1992
Phys. Rev. A
10
1
5
0
View full text Add to dashboard Cite

Spectroscopy of Triatomic Hydrogen Molecules in a Beam

Molecular Hydrogen in the Ionized Region of Planetary Nebulae

Contact Info

Product

Resources

About

Experimental study of the triatomic hydrogen molecule through the collisional sequenceH3+→H

Cited by 32 publications

References 30 publications

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→HFaria1, Wolff2, Coelho3 et al. 1992Phys. Rev. A10150View full textAdd to dashboardCite

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→HFaria1, Wolff2, Coelho3 et al. 1992Phys. Rev. A10150View full textAdd to dashboardCite

Spectroscopy of Triatomic Hydrogen Molecules in a Beam

Molecular Hydrogen in the Ionized Region of Planetary Nebulae

Contact Info

Product

Resources

About

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H
Faria
¹
,
Wolff
²
,
Coelho
³

et al. 1992
Phys. Rev. A
10
1
5
0
View full text Add to dashboard Cite

Center-of-mass energy distributions of the fragments from the collisional breakup reactionH3+→H
Faria
¹
,
Wolff
²
,
Coelho
³

et al. 1992
Phys. Rev. A
10
1
5
0
View full text Add to dashboard Cite