Einstein A-coefficients and transition dipole moments for some ion-pair to valence transitions in I2

The relative fluorescence intensities of all the strong electronic transitions from five of the first cluster of ion-pair (IP) states of I2 and from three states in the second cluster have been measured. The fluorescence, in most cases from ν′ = 0, was dispersed and comprised both discrete and continuous (bound → free) spectra. These were fitted and each simulated electronic spectrum integrated separately to give relative values of the Einstein A-coefficients (summed over final vibrational states) for each transition. Using previously reported lifetimes, transition dipoles for each of the parallel transitions from nine IP states are deduced, together with some of the stronger perpendicular transition dipole moments. At R e of the ion-pair states, μ‖ (five transitions observed) is almost constant at 0·2–0·3 D, but μ‖ ranges between 0·7 and 3·7 D. There is a marked difference in the parallel transition moments associated with some g/u pairs in the same cluster of IP states which can be accounted for by the ...

[1]  K. Obi,et al.  An optical-optical double resonance spectroscopy of bromine through the A3.PI.(1u) state: analyses of the Ou+, 1u, and 2u(3P2) ion-pair states , 1991 .

[2]  P. Langridge-Smith,et al.  DETERMINATION OF THE RADIATIVE LIFETIMES OF NINE ION-PAIR STATES OF I2 , 1991 .

[3]  M. Heaven,et al.  Observation and analysis of the D'←A' transition of I2 in a free-jet expansion , 1991 .

[4]  P. Jewsbury,et al.  A model for the relative intensities among ion pair → valence transitions in the heavier halogens and rare gas halides , 1990 .

[5]  E. Tiemann,et al.  Hyperfine structure of the lowest O+ g and 1g ion pair states of I2 , 1989 .

[6]  G. W. King,et al.  The three-photon absorption spectrum of 127I2 and 129I2 in the region 16 500–18 500 cm−1 , 1989 .

[7]  R. Francke,et al.  The 337-nm nitrogen laser resonances with the f 0 g + ( 3 P 0 )-B 0 u + transitions in molecular lodine (I 2 ) , 1988 .

[8]  A. R. Hoy,et al.  NoteA third-tier lonic state of lodine, f′Og+(1D): Access by four-photon transitions☆ , 1987 .

[9]  M. Broyer,et al.  Ω doubling in 1 g state and electronic transition moments for B0+ u towards 0+ g and 1 g (3 P 2) states of iodine , 1987 .

[10]  M. Broyer,et al.  Electronic transitions moments from both fluorescence intensities and lifetime measurements for transitions involving the I2 ionic states , 1987 .

[11]  I. Tanaka,et al.  A Spectroscopic Study of the D(0u , 1987 .

[12]  I. Tanaka,et al.  An analysis of the F(0U+) ion-pair state of I2 by optical−optical double resonance , 1986 .

[13]  J. Brand,et al.  Rotational coupling of the β 1 and E 0+ ion-pair states of lodine bromide☆ , 1985 .

[14]  J. Tellinghuisen.  Potentials for weakly bound states in I2 from diffuse spectra and predissociation data , 1985 .

[15]  R. Bacis,et al.  Hyperfine structure of the f(0 + g ) state of iodine investigated through cw optical-optical double resonance , 1984 .

[16]  M. Broyer,et al.  Calculation of the magnetic hyperfine interaction in the E and X states of iodine with the separated-atom theory , 1984 .

[17]  I. Tanaka,et al.  Spectroscopic study on the iodine molecule by a sequential three‐photon excitation , 1984 .

[18]  J. Tellinghuisen.  D' .fwdarw. 2u(3.DELTA.) transition in iodine. Analysis by classical and quantum spectral simulations , 1983 .

[19]  R. Field,et al.  Long range behavior of the gerade states near the 2P3/2+ 2P3/2 iodine dissociation limit by laser‐induced‐fluorescence Fourier‐transform spectroscopy , 1983 .

[20]  K. Viswanathan,et al.  The 2880-Å emission spectrum of I2: Ion-pair states near 47 000 cm−1 , 1983 .

[21]  M. Saute,et al.  Calculated long‐range potential‐energy curves for the 23 molecular states of I2 , 1982 .

[22]  J. Brand,et al.  The E-B band system of diatomic iodine , 1982 .

[23]  R. Field,et al.  Rotation–vibration analysis of the B 0+u–a 1g and B 0+u–a′ 0+g electronic systems of I2 by laser‐induced‐fluorescence Fourier‐transform spectroscopy , 1981 .

[24]  K. Viswanathan,et al.  Analysis of the 2770-Å emission system in I2 , 1981 .

[25]  G. W. King,et al.  Two-photon sequential absorption spectroscopy of iodine-127 and 129 in the 5 eV region , 1981 .

[26]  R. Leroy.  Molecular Constants and Internuclear Potential of Ground-State Molecular Iodine , 1970 .

[27]  J. Bearden,et al.  Atomic energy levels , 1965 .

[28]  G. Shortley,et al.  The Theory of Atomic Spectra , 1935 .