28132-48-1Relevant articles and documents
Further measurements of the H3+ (v = 0,1,2) dissociative recombination rate coefficient
Canosa, A.,Gomet, J. C.,Rowe, B. R.,Mitchell, J. B. A.,Queffelec, J. L.
, p. 1028 - 1037 (1992)
A new flowing afterglow apparatus that utilizes a Langmuir probe/mass spectrometer to monitor both electron and ion decay in a hydrogen plasma has been used to measure the dissociative recombination rate coefficient of H3+ at two different electron temperatures.At 300 K a rate coefficient of 1.5 * 10-7 cm3 s-1 was found for H3+ ions with a low degree of vibrational excitation (v2).The rate coefficient for ground state ions H3+ (v = 0) was measured as 1.1 * 10-7 cm3 s-1 at 650 K.A discussion is given of the excitation states of H3+ ions in the afterglow in the light of slow deexcitation rates for low vibrational states.A new model for the recombination of H3+ is presented.
Photo-assisted fragmentation spectroscopy of triatomic hydrogen
Selgren, Susan F.,Gellene, Gregory I.
, p. 485 - 489 (1988)
The R0(0) line of the 3s2A′1←2p2A″2 transition of the H3 radical has been observed in absorption by the new technique of photo-assisted fragmentation spectroscopy. A fast beam of metastable H3 radicals produced by H3+/K electron transfer is interacted with visible light from a dye laser. Optical absorption is detected by observing a decrease in parent peak intensity in the H3+ neutralization-reionization mass spectrum, resulting from dissociation of the neutral molecule. Absorption line widths are observed to be instrumentally limited (≈ 0.05 cm-1) as the upper state of the transition is spectroscopically long lived. Application of the technique to various second-row hypervalent hydride radicals is discussed.
The dissociative recombination rate coefficients of H3+, HN2+, and HCO+
Amano, T.
, p. 6492 - 6501 (1990)
The dissociative recombination rate coefficients for H3+, HN2+, and HCO+ are determined at 110, 210, and 273 K by monitoring the decay of the infrared absorption signals as a function of time.The rate coefficients are 1.8, 7.0, and 3.1 in units of 10-7 cm3 s-1 for H3+, HN2+, and HCO+. respectively, at 273 K.These values agree very well with those obtained using the stationary afterglow or the merged beam techniques, but the values for H3+ disagree with that obtained by Smith and co-workers (2x10-8 cm3 s-1) using the flowing afterglow/Langmuir probe method.The rate coefficients for H3+ and HCO+ disagree with theory which has predicted very slow dissociative recombinations in the lower vibrational states.The temperature dependences obtained here, although the temperature range is rather limited, are consistent with those obtained previously using the stationary afterglow (for H3+ and HCO+) and the merged beam (for HN2+) techniques.The measurements are extended to several vibration-rotation levels and no significant rotation dependence of the rate coefficients is observed.It has also been found that the ions investigated here can be equally abundant at ice temperature as at liquid nitrogen temperature.
H3++O: An experimental study
Milligan, Daniel B.,McEwan, Murray J.
, p. 482 - 485 (2008/10/08)
We have measured the reaction rate coefficient and branching ratios for the H3++O atom reaction using a flowing afterglow/selected ion flow tube operating at room temperature (295±5 K). The measured rate coefficient was k=(1.2±0.5)×10-9 cm3 s-1 and the branching ratios were OH++H2, (70%) and H2O++H (30%). This reaction has some relevance to the synthesis of water in interstellar clouds.
A Study of the Reactions of H3(+), H2D(+), HD2(+), and D3(+) with H2, HD, and D2 Using a Variable-Temperature Selected Ion Flow Tube
Giles, Kevin,Adams, Nigel G.,Smith, David
, p. 7645 - 7650 (2007/10/02)
The reaction of H3(+) with H2 in all possible deuterated combinations a VT-SIFT apparatus.The experimentally determined equilibrium constants are compared with those calculated using statistical mechanics.In general, the experimental and calculated equilibrium constants are in agreement at 300 K but differ significantly at 80 K.The discrepancy is considered in terms of nonequilibration of the reactant species at temperatures below 300 K in the VT-SIFT.
