The Continuous Absorption Spectrum of Bromine: A New Interpretation (English)

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In: The Journal of Chemical Physics   ;  4 ,  8  ;  474-479  ;  1936

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The continuous absorption spectrum of bromine was investigated quantitatively at six temperatures from 293°K to 906°K, and the contributions of the vibrational levels v″ = 0 and v″ = 1 to the total continuum were deduced from the variation of the absorption coefficients with temperature. Contrary to expectation, the absorption from the level v″ = 1 has three maxima and not two, and the absorption from v″ = 0 has a decided hump on the long wavelength side of the maximum. These results can be explained if the bromine continuum is composed of two overlapping continua, the stronger one (A) with its maximum at λ4150, and the weaker (B) with its maximum at λ4950. Although it is possible to assign A to the transition 3Π0+u←1Σg+, and B to 3Π1u←1Σg+, better agreement with the Franck‐Condon principle is obtained if A is assigned to 1Πu←1Σg+, and B to 3Π0+u←1Σg+. The latter interpretation is also correlated with what is known of the chlorine and iodine continua. On either assumption, the value of re for 3Π1u of bromine is predicted to be about 2.6A.

Table of contents – Volume 4, Issue 8

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The Reactions of Deuterium Atoms with Methane and Ethane
Steacie, E. W. R. / Phillips, N. W. F. | 1936
The Absorption Spectrum of Methyl Alcohol Vapor in the Photographic Infrared
Badger, Richard M. / Bauer, Simon H. | 1936
The Continuous Absorption Spectrum of Bromine: A New Interpretation
Acton, A. P. / Aickin, R. G. / Bayliss, N. S. | 1936
The Theoretical Treatment of Chemical Reactions Produced by Ionization Processes Part I. The Ortho‐Para Hydrogen Conversion by Alpha‐Particles
Eyring, Henry / Hirschfelder, J. O. / Taylor, Hugh S. | 1936
The Electron Affinity of Bromine Atoms from Space‐Charge Effects
Glockler, Geo. / Calvin, Melvin | 1936
The Limiting High Temperature Rotational Partition Function of Nonrigid Molecules VI. The Methanol Equilibrium
Kassel, Louis S. | 1936
Kinetics of Recombination of Iodine Atoms
Rabinowitch, E. / Wood, W. C. | 1936
The Homogeneous Unimolecular Decomposition of Gaseous Alkyl Nitrites VI. The Decomposition of n‐Butyl Nitrite
Steacie, E. W. R. / Smith, W. McF. | 1936
The Normal Vibrations and the Isotope Effect of Molecules of the Type X2YN with an N‐Fold Axis of Symmetry
Schimmel, Herbert | 1936
Transfer of Rotational Energy in Molecular Collisions I. Elementary Processes Which Lead to Abnormal Rotation of the HgH Molecule
Rieke, F. F. | 1936
The Effect of Rotational Distortion on the Thermodynamic Properties of Water and Other Polyatomic Molecules
Wilson, E. Bright | 1936
Thermodynamic Properties of Phosphorus Compounds
Anderson, Thomas F. / Yost, Don M. | 1936
Atomic Dimensions from the Coefficients of Compressibility and Thermal Expansion
Djang, G. F. | 1936
The Structure of Rubrene and Some Remarks on the ``Ortho‐Effect''
Bergmann, E. / Herlinger, E. | 1936
The Raman Spectra of Deutero‐acetones and Methyl Alcohol‐d
Bates, J. R. / Anderson, Leigh C. / Halford, J. O. | 1936
Raman Spectrum of Deutero‐Acetaldehyde
Wood, R. W. | 1936
Preliminary Note on the Phase Relationships in the Nickel‐Tin System
Fetz, Erich / Jette, Eric R. | 1936