Initial distribution of vibration of the OH radicals produced in the H + O3 → OH(X2Π1/2,3/2) + O2 reaction. Chemiluminescence by a crossed beam technique

Ohoyama, Hiroshi; Kasai, Toshio; Yoshimura, Y.; Kimura, Hiroaki; Kuwata, Keiji

doi:10.1016/0009-2614(85)85312-4

Cited by 73 publications

(68 citation statements)

References 17 publications

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“…More recently, we have suggested that ozone could be produced through the reaction [29][30][31] in conjunction with the three-body recombination of the atomic oxygen produced by other channels of the branching reaction 5, namely Moreover, further atmospheric ozone sources have been suggested in our Group involving vibrationally excited O 2 (V′, j′) 6,7,8 or HO 2 (W) 32 instead of OH(V′) in eq 5 [and, correspondingly, in eq 6 to eq 8]; W stands for the three vibrational normal modes of HO 2 . In addition, it has been shown that the traditional O x and HO x ozone depletion cycles could be reformulated to act as ozone sources.…”

Section: Introductionmentioning

confidence: 85%

Dynamics Study of the OH + O₂Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

2002

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The vibrational relaxation processes occurring during collisions of vibrationally excited O 2 and OH are investigated using the quasiclassical trajectory method and a realistic double many-body expansion (DMBE I) potential energy surface for ground-state HO 3 . A salient feature is the observation of multiquanta deactivation processes for such high internal energies. It is also shown that the vibrational relaxation of colliding molecules is far less important than the reactive processes leading to formation of "odd-oxygen" (and hence ozone) under stratospheric local thermodynamic disequilibrium conditions.

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Section: Introductionmentioning

confidence: 85%

Dynamics Study of the OH + O₂Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

2002

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“…In this case, the AG predictions show an almost negligible population for v = 1, while for v = 9 it is almost of the same order of magnitude as the single-collision results. For comparison, the nascent (Ohoyama et al, 1985) and steady-state distributions reported from single collision trajectory dynamics (Varandas, 2003) are also shown in Fig. 2.…”

Section: Implications Of the O+oh Reaction On The Oh(v) Profilesmentioning

confidence: 99%

“…The nascent OH is produced mostly in high vibrational states Murphy, 1971;Ohoyama et al, 1985), v = 7, 8, peaking at 9. The mechanism leading to the population of lower states, which are responsible for the intense Meinel bands emission, is still a subject of controversy .…”

Section: Introductionmentioning

confidence: 99%

Implications of the O + OH reaction in hydroxyl nightglow modeling

2013

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Abstract. The hydroxyl nightglow has been examined anew using calculated rate constants for the key reactive and inelastic O + OH(v ) quenching processes. These constants have been obtained from quasiclassical trajectories run on the adiabatic ab initio-based double many-body expansion-IV potential energy surface for the ground state of the hydroperoxil radical. Significant differences in the vertical profiles of vibrationally excited hydroxyl radicals are obtained relative to the ones predicted by Adler-Golden (1997) when employing an O + OH(v ) effective rate constant chosen to be twice the experimental value for quenching of OH(v = 1). At an altitude of 90 km, such deviations range from ∼ 80 % for v = 1 to only a few percent for v = 9. Other mechanisms reported in the literature have also been utilized, in particular those that loosely yield lower and upper limits in the results, namely sudden-death and collisional cascade. Finally, the validity of the steady-state hypothesis is analysed through comparison with results obtained via numerical integration of the master equations.

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“…The beam intensity of HS is estimated by measuring the HF+ emission intensity at 670 nm (30). Ozone, produced by an ozonizer and concentrated at a dry-ice ethanol ozonetrap, directly effused into the reaction chamber (27,31).…”

Section: Methodsmentioning

confidence: 99%

“…A liquid nitrogen trap was used in the reaction chamber when necessary, but for safety reasons no trap was used when we used ozone. For the H F~ measurement, the F atoms, generated by microwave discharge of CF,, effuse from the Teflon nozzle and enter the reaction chamber through a 2-mm + collimator (26,27). H,S directly effuses into the reaction chamber and reaction [2] takes place in the reaction volume (the beam intersection).…”

Section: Introductionmentioning

confidence: 99%

Nascent HF^† and HSO(²A′) formations in the elementary reactions of F + H₂S and HS + O₃ and the internal energy distributions

Yoshimura¹,

Kasai²,

Ohoyama³

et al. 1995

Can. J. Chem.

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Chemiluminescence of the vibrationally excited HF' and of the electronically excited HSO* in the 2~' state were observed in the elementary reactions of F + H,S and HS + 0,. In the F + H,S reaction, the vibrational populations of HF' in v = 3 and 4 were found to be nonstatistical but the rotational distribution in the v = 4 state was found to be Boltzmann-like with a rotational temperature of 700 K, confirming similar data obtained by different methods. The HSO* emission was observed in the HS + 0, elementary reaction. The spectrum of HSO* characterized by broad vibrational bands indicates nonstatistical excitation for the rotational and vibrational states.

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Initial distribution of vibration of the OH radicals produced in the H + O3 → OH(X2Π1/2,3/2) + O2 reaction. Chemiluminescence by a crossed beam technique

Cited by 73 publications

References 17 publications

Dynamics Study of the OH + O₂Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

Dynamics Study of the OH + O₂Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

Implications of the O + OH reaction in hydroxyl nightglow modeling

Nascent HF^† and HSO(²A′) formations in the elementary reactions of F + H₂S and HS + O₃ and the internal energy distributions

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Initial distribution of vibration of the OH radicals produced in the H + O3 → OH(X2Π1/2,3/2) + O2 reaction. Chemiluminescence by a crossed beam technique

Cited by 73 publications

References 17 publications

Dynamics Study of the OH + O2Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

Dynamics Study of the OH + O2Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

Implications of the O + OH reaction in hydroxyl nightglow modeling

Nascent HF† and HSO(2A′) formations in the elementary reactions of F + H2S and HS + O3 and the internal energy distributions

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Dynamics Study of the OH + O₂Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

Dynamics Study of the OH + O₂Branching Atmospheric Reaction. 4. Influence of Vibrational Relaxation in Collisions Involving Highly Excited Species

Nascent HF^† and HSO(²A′) formations in the elementary reactions of F + H₂S and HS + O₃ and the internal energy distributions