Vibrational Relaxation of Nitric Oxide in Argon

Kamimoto, Goro; Matsui, Hiroyuki

doi:10.1063/1.1673869

Cited by 45 publications

(9 citation statements)

References 7 publications

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“…The vibrational relaxation in these one-dimensional flows is well understood, relatively simple to model, and readily measured with conventional techniques, such as laser absorption 6 or infrared emission. 7 Although the primary results of the present study were obtained in these simple flows, they clearly demonstrate the potential of PLIF imaging to simultaneously probe nonequilibrium and visualize shock-wave structure in more complex multidimensional flows.…”

Section: Introductionmentioning

confidence: 83%

Planar laser-induced fluorescence imaging of shock-tube flows with vibrational nonequilibrium

1992

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Single-shot planar laser-induced fluorescence images of nitric oxide in shock-heated flows with vibrational nonequilibrium are reported. The results demonstrate that planar laser-induced fluorescence imaging is a promising diagnostic technique for multidimensional high-speed flows because of its ability to examine shock structure and to visualize and measure vibrational nonequilibrium. The flows studied were generated within a shock tube and were composed of dilute mixtures of NO in argon. A narrow-band ArF laser tuned to the D +-X (0,1) R 2 (28.5) transition of NO at 193.346 nm was used as the excitation source. The broadband fluorescence was collected at 90 deg to the path of excitation using an intensified, two-dimensional photodiode array. Images presented include a normal incident shock, a normal reflected shock, and a four-image sequence of the development of high-temperature supersonic flow over a two-dimensional blunt body. The vibrational relaxation in the downstream region of the normal shocks is analyzed and compared with calculations based on known relaxation rates.

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Section: Introductionmentioning

confidence: 83%

Planar laser-induced fluorescence imaging of shock-tube flows with vibrational nonequilibrium

1992

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“…Equation (4.5) leads to the following detailed temperature dependence of LZ k SH* 1,0 (T ), as expressed through the molecular parameters of the free NO molecule M, r e , A and the parameters of the NO-Ar collision complex in the optimal configuration, µ, R a , α a , θ a , E a , E (2) a ,…”

Section: )mentioning

confidence: 99%

“…Crossing energies E c (θ) = V A (R c (θ), θ) (full blue line) and their quadratic approximation E(2) c (θ) (dotted blue line) within the angular range indicated inFig. 1by the dashed straight blue lines.…”

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confidence: 99%

Electronically nonadiabatic mechanism of the vibrational relaxation of NO in Ar: Rate coefficients from ab initio potentials and asymptotic coupling

Dashevskaya

Nikitin

Troe

2018

The Journal of Chemical Physics

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In this paper, the electronically nonadiabatic Landau-Zener (LZ) mechanism for the vibrational relaxation v = 1 → v = 0 of NO(XΠ) in collisions with Ar(S01) is discussed. It corresponds to nonadiabatic transitions between two crossing vibronic potential energy surfaces (PESs) originating from vibrational states of the collision complex and supported by two coupled electronic PESs. The LZ rate coefficients k10LZ are calculated within the uniform Airy approach in the reaction coordinate approximation with parameters derived from ab initio PESs and an asymptotic estimation of the Franck-Condon factor in the nonadiabatic coupling region. The rate coefficients are close to the experimental rate coefficients available over the range of 900-2500 K, where the electronically adiabatic Landau-Teller (LT) mechanism with the rate coefficients k10LT does not make a noticeable contribution to the total relaxation rate. The ratio k10LZ/k10LT increases with temperature and the LZ and LT mechanisms have comparable rates at about 4000 K.

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“…For NO the V + T process has been studied over a wide temperature range for M = Ar and NO (26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38). For M = H,O, CO,, N,, and CO there are only measurements at 300 "K (28).…”

Section: Comentioning

confidence: 99%

Energy Transfer Processes in the Stratosphere

Taylor¹

1974

Can. J. Chem.

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During the past clecacle or two considerable fundamental information has been acquired on the mechanisms and rates of molecular energy transfer among vibrational, rotational, and electronic states. It is a well-known fact that the rate and even the products of a chemical reaction can be n~arltedly influenced by the degree of internal state excitation of the reactants. Also, it is clear that many of the chemical processes o c c~~r r i n g in the upper atmosphere produce atoms or n~olecules in excited states. I t will be the purpose of this paper to review the state of knowledge of energy transfer nlechanisn~s and kinetic rates as it pertains to atmospheric constituents and to attempt to indicate possible important roles of energy, transfer in the physics and chemistry of the stratosphere. Some specific examples will rnclude vibrational relaxation of OH a n d On, the possible role of atomic species as quenchants, and electronic/vibrational energy transfer processes.ALI cours des deus dernitres cltcennies, de l'information fonclamentale considtrable a 6tc acquise sur les micanismes et les vitesse de transfert d'tnergie mol6culaire entre les ttats vibrationnels, rotationnels et Clectroniq~~es. C'est un fait bien connu que la vitesse et m&me les produits d'tlne rCaction chimique peuvent &tre profondtment influences par le degrt d'activation de l'itat interne des I-tactifs. Aussi, est-il clair que plusieurs cles processus chinriques survenant dans la haute atn1osphkr:e produisent cles atonles o u des moltcules aux ttats excitts. 11 sera du but de cette p~~blication de donner un cornpte rendu sur les connaissances des mtcanismes et des vitesses cinttiqlles de transfert d'tnergie conlme il apparlient aux constit~~ants atmosphtriq~~es et de tenter cl'indiquer des r6les importants possibles de transfert d'tnergie dans la physique et la chimie de la stratosphkre. Quelques exemples prtcis comprenclront une relaxation vibrationnelle de OH el O:,, le r61e possible d'esptces a t o m i q~~e s comme inhibiteurs et cles processus de transfer1 d'inergie tlectronique/vibrationnelle.[Traduit par le journal]Can.

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Vibrational Relaxation of Nitric Oxide in Argon

Cited by 45 publications

References 7 publications

Planar laser-induced fluorescence imaging of shock-tube flows with vibrational nonequilibrium

Planar laser-induced fluorescence imaging of shock-tube flows with vibrational nonequilibrium

Electronically nonadiabatic mechanism of the vibrational relaxation of NO in Ar: Rate coefficients from ab initio potentials and asymptotic coupling

Energy Transfer Processes in the Stratosphere

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