Fluorescence of the Na*–N2 collision complex

Kamke, W.; Kamke, B.; Hertel, I. V.; Gallagher, A. C.

doi:10.1063/1.446509

Cited by 19 publications

(23 citation statements)

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“…The concentration of carbon dioxide molecules N0 in flame was determined by the formula: At the processing of the experimental data the small contribution of water molecules in the broadening of Na-D lines was taken into account in the approximation ofbinary interactions between flame atoms and molecules5: K(Ac.r) = keff(LW)KHO(&T)NNaNHO (6) NNa N0 where kdic) is the measured effective absorption coefficient in the flame of the given molecular composition, KHO (Lo-) is the reduced absorption coefficient for Na-D lines broadened by iter molecules7 at Tfl=2125 K.…”

Section: Methodsmentioning

confidence: 99%

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<title>Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example</title>

Zarkova¹,

Pirgov²,

Paeva³

et al. 1996

SPIE Proceedings

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ABSTRACFPreliminary results of restoring potentials of interactions Na(3s,3p)-CO( X'Z) from measured far wing spectra of sodium resonance line Na-D perturbed by CO are presented. The spectra in the range ofAc1O-35OO cm' are considered following the quasi-static theory ofline broadening by inert gases as continua and due to the A->X and B*->X transitions of Na-CO quasi-molecules. The reduced absorption coefficient K(o) at frequency a=o+A is calculated ascorresponding to the radiation from molecules with internuclear separation R, where hcci =V V' ( VAB and Vx are the excited and ground state adiabatic potentials respectively). As a first approximation, all the three potentials are presented in the shape of a (6,12)-Lennard-Jones potential. The constants C6 and C12 are determined as independent variables by minimization of the sum of squared deviations between measured and calculated K(). Four versions of minimization were considered successively: (1) only red wing, (2) only blue wing (3) both blue and red wings with 6 independent variables ( C6 and C1., ), and (4) both wings with fixed C6 . The calculated K(E) are compared to the measured ones.Keywords: reduced absorption coefficient, spectral line broadening, atom-molecule interaction potentials. INTRODUCHONPhenomena that critically depend on the interaction potential of unstable species include cross sections for excitation transfer, quenching of excited states, spin exchange, depolarisation, elastic scattering of atomic beams, chemical reactions, dissociation processes, shift and broadening of spectral lines, etc. Investigations of the wing profiles of spectral lines serve as a valuable source of information about atom-molecular interaction potentials. At present, the profiles of alkali metal atoms' spectral lines under conditions of broadening by monatornic inert gases appear to be the best studied both theoretically and experimentally'. In the case of interaction between alkali atoms and molecules the theory is much more complex because the interaction potential depends also on the relative orientation of the orbital moment vectors of interacting particles. Hence, each particular pair has to be considered individually. Then, to restore interaction potential from the spectral line far wing profile, a reverse ill-posed problem has to be solved2.Unfortunately, few studies into the broadening of spectral lines of atoms of alkali metals by molecular gases are known and in most of them35 the measurements have been performed in flames of complex molecular composition, which made it difficult to determine the individual contribution of molecules of every given type. The broadening ofNa-D lines by a single component molecular gas has been studied for N2 6 H20 and CO 8 but the interaction potentials have been derived only for N2. Meanwhile, the mixture of these three molecular gases is of practical importance as it is the product of combustion of hydrocarbon fuels in air.In 8 the reduced spectral absorption coefficient was measured. The measurements were performed in a...

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Section: Methodsmentioning

confidence: 99%

“…More reliable data for potential parameters can be obtained taking into consideration independent experimental information to fix the ground state potential and additional experimental data on K(a) temperature dependency. 6. ACKNOWLEDGEMENTS This work was partially supported by a contract F-464 with Bulgarian Research Foundation.…”

Section: Check Of the Solutionmentioning

confidence: 97%

<title>Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example</title>

Zarkova¹,

Pirgov²,

Paeva³

et al. 1996

SPIE Proceedings

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“…It is reasonable to assume, that the diabatic interaction does not inÑuence the quasi-static wing in emission and absorption, as the presence of the quenching channels of the exited states does not inÑuence the population of these states under conditions of thermodynamic equilibrium. However, the situation varies when the wing Ñuorescence proÐle [45] or excitation wing spectrum [46] are registered. In these cases the probability of quenching can depend on the distance between the Ñuorescence atom and the perturbing molecule and thereby inÑuence the registered proÐle of the quasi-static wing.…”

Section: T He Impact Approximationmentioning

confidence: 99%

“…If these potentials are known the normalized line shape can be unambiguously calculated [45]. But the inverse problem, namely, the restoration of interaction potentials on the base of the measured normalized SL proÐles, is incorrect in a general case, as it admits a multitude of decisions for and…”

Section: T He Problem Of Restoration Of Adiabatic Interaction Potentimentioning

confidence: 99%

“…There are a few papers on the restoration of the interaction potentials of the alkali atoms with molecules in literature. First of all, there is the paper of W. Kamke et al [45], in which the quasi-static formalism was extended to the molecular broadening particles. In this work the algorithm of calculation of the quasi-static wings of the Na-D doublet broadened by molecules was pre-N 2 sented.…”

Section: T He Problem Of Restoration Of Adiabatic Interaction Potentimentioning

confidence: 99%

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Enhancement of Current Drivability of Nanograting Polycrystalline Silicon Thin-Film Transistors

Kuroki

Zhu

Kotani

et al. 2010

Jpn. J. Appl. Phys.

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The experimental investigations devoted to the Na-D spectral line broadening by molecular gases are reviewed. The theoretical interpretation of the data within the framework of the classical theory of atomic spectral line broadening is given. The e †ect of adiabatic and diabatic collisions on the shape of both impact and quasi-static spectral-line wings is discussed. The di †erent forms of spectral-line shape representation and the connections between them are considered. The experimental cross-sections of the Lorentzian broadening of the Na-D lines by molecules are presented and compared with the theoretical ones. The problem of restoration of the adiabatic interaction potentials from quasi-static wing proÐles is noted. The C 6 , parameters of the e †ective atom-molecular potentials of the Lennard-C 12 Jones 12-6 form, restored on quasi-static wing proÐles, are presented.

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Ultrafast Processes and Transitionstate Spectroscopy

Lin

Fain

Hamer

1990

Advances in Chemical Physics

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Fluorescence of the Na*–N2 collision complex

Abstract: Articles you may be interested inThe study for the incipient solvation process of NaCl in water: The observation of the NaCl-(H2O) n (n = 1, 2, and 3) complexes using Fourier-transform microwave spectroscopy

Cited by 19 publications

References 12 publications

<title>Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example</title>

<title>Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example</title>

Enhancement of Current Drivability of Nanograting Polycrystalline Silicon Thin-Film Transistors

Ultrafast Processes and Transitionstate Spectroscopy

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