scholarly journals Dynamics of the B 3Π(0u+) and A 3Π(1u) States of Chlorine by Laser Induced Fluorescence

1992 ◽  
Vol 12 (1-2) ◽  
pp. 75-84 ◽  
Author(s):  
E. Martínez ◽  
F. J. Basterrechea ◽  
B. Cabañas ◽  
P. Puyuelo ◽  
M. R. López
Keyword(s):  
Radiative Lifetime ◽  
Laser Induced Fluorescence ◽  
Trial And Error ◽  
Interference Effects ◽  
A Value ◽  
Vibrational Levels ◽  
Franck Condon

Chlorine B 3Π(0u+) state lifetimes have been measured by laser-induced fluorescence in several predissociated (υ′ = 14–19,21) and non-predissociated (υ′ = 5–12) levels. Trial and error Franck-Condon calculations have been performed to check the nature and position of the predissociating state. The results have been used to give a value of Re for the A 3Π(1u) state responsible for predissociation, Re = 2.48 ± 0.01 Å. The obtained data show that interference effects due to crossing between B and A states modify the lifetimes of the B state appreciably. The inadequacy of the low-lying vibrational levels region, i.e. υ′ < 8, to measure the radiative lifetime of the B state (τR(B)) is shown. Previous values for τR(B) can therefore be affected by considerable errors.

Resonance fluorescence intensities and vibrational assignments in the A2B2 state of NO2

1982 ◽  
Vol 60 (8) ◽  
pp. 1081-1087 ◽  
Author(s):  
J. C. D. Brand ◽  
K. J. Cross ◽  
A. R. Hoy
Keyword(s):  
Radiative Lifetime ◽  
Rotational Constant ◽  
Resonance Fluorescence ◽  
Final State ◽  
Vibrational Assignments ◽  
Quantum Numbers ◽  
A Value ◽  
Franck Condon

The intensity of NO2 resonance fluorescence excited at several wavelengths in the range 5930–6480 Å has been measured as a function of final state vibrational quantum numbers. Calculations based on these Franck–Condon profiles establish the relative vibrational assignments of five bands in the [Formula: see text] system. In one case, the similarities between a Ka = 1 and a Ka = 6 profile lead to a value of the à 2B2A rotational constant of ~3.0 cm−1. The influence of Franck–Condon profiles on the radiative lifetime of pure à 2B2 states is investigated.

Vibration-rotation bands and rotational constants of dideuteroacetylene

1955 ◽  
Vol 232 (1190) ◽  
pp. 291-309 ◽  
Keyword(s):  
Resolving Power ◽  
Vibrational States ◽  
Absorption Bands ◽  
Rotational Constants ◽  
Vibrational Assignments ◽  
Vibrational Anharmonicity ◽  
A Value ◽  
Vibrational Levels ◽  
Vibration Rotation ◽  
Very High

Nine vibrational absorption bands of dideutero-acetylene have been examined with very high resolving power. The rotational constants have been determined for the vibrational levels concerned, and the coefficients α i have been determined with more convincing accuracy than previously. In some of the bands the Q branches have been resolved, so that the l -doubling coefficients q i could be derived, and details could be established about the doublet components in some II levels. The results emphasize the need of high resolution if the vibrational assignments are to be unambiguous, and if reliable values of the rotational constants are to be derived. A value of B e has been obtained, and the vibrational anharmonicity coefficients have been considered briefly. Estimates of the centrifugal stretching constants D i in different vibrational states have been made, and one anomalous case has been found.

Radiative lifetime of the Te2 A(0u+) state studied by laser-induced fluorescence

1989 ◽  
Vol 156 (6) ◽  
pp. 564-568 ◽  
Author(s):  
E. Martínez ◽  
P. Puyuelo ◽  
F.J. Basterrechea ◽  
M.T. Martínez
Keyword(s):  
Radiative Lifetime ◽  
Laser Induced Fluorescence

Energiemessung von Photoelektronen und Franck— Condon-Faktoren der Schwingungsübergänge einiger Molekülionen

1967 ◽  
Vol 22 (5) ◽  
pp. 705-710 ◽  
Author(s):  
Reimar Spohr ◽  
Ewald Von Puttkamer
Keyword(s):  
Resonance Line ◽  
Potential Method ◽  
Molecular Ions ◽  
Vibrational Structure ◽  
Vibrational Levels ◽  
Condon Factors ◽  
Experimental Values ◽  
Franck Condon

The energy of photoelectrons ejected by 21.21 eV quanta of the He resonance line is measured with a retarding potential method at a resolution of 40 meV. Vibrational structure of the molecular ions H2+, D2+, O2+, N2+, NO+, CO2+, N2O+ H20, and HC ≡ CH+ is resolved and experimental values of the FRANCK-CONDON factors for the transitions into these vibrational levels are given.

Collisional Deactivation Rates of Electronically Excited Molecular Ions. II

1972 ◽  
Vol 50 (1) ◽  
pp. 1-7 ◽  
Author(s):  
G. I. Mackay ◽  
R. E. March
Keyword(s):  
Rate Constants ◽  
Radiative Lifetime ◽  
Molecular Ions ◽  
Deactivation Rate ◽  
Complete Knowledge ◽  
Induced Dipole ◽  
Excited Species ◽  
Vibrational Levels ◽  
Electronically Excited ◽  
Deactivation Rate Constant

Total deactivation rate constants have been determined for N2+(B2Σu+) and the (A2Πu) and (B2Σu+) states of CO2+ with a number of quenchers. The energy specific total deactivation rate constant is compared to the total radiative lifetime of the excited species. A particular novelty of the technique is that it does not require a complete knowledge of the formation modes for the excited species. The results are compared with theoretical values obtained from the ion-induced dipole model. Individual deactivation rate constants are presented for N2+(B2Σu+) ions in the v = 0, 1, and 2 vibrational levels quenched by N2, O2, H2, and CO2; and for the(A2Πu) and (B2Σu+) states of CO2+ quenched byCO2, N2, O2, NO, and H2. Charge transfer is the most probable mode of deactivation except in the CO2+–H2 reactions where H-atom abstraction is more probable.

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