Predissociation in the spectrum of OH; the vibrational and rotational intensity distribution in flames

The Royal Society - Tập 208 Số 1092 - Trang 63-75 - 1951
A. G. Gaydon1, H. G. Wolfhard1
1Chemical Engineering Department, Imperial College, London S.W. 7

Tóm tắt

In the main 3064 Å system of OH higher rotational levels of bands with v' = 1 and all levels with v' ≥ 2 are affected by a weak predissociation. One spin component of the 2Ʃ + levels is more strongly affected than the other. Of the three molecular states, 4II, 4Ʃ ¯ and 2Ʃ ¯ which could conceivably cause the predissociation, only the 2Ʃ ¯ could produce this effect. The predissociation is observed in the OH bands from a discharge and from the reaction zone of an oxy-acetylene flame at low pressure, and also to some extent in a flame at atmospheric pressure. The predissociation, and its reverse process, a ‘pre-association’, may also affect the vibrational intensity distribution if there is departure from equilibrium. Striking anomalies of this type in hydrogen flames are interpreted in this way. For flames at 1 atm. pressure there appears to be an excess of free atoms in the flame, and at low-pressure emission of radiation from the flame disturbs the equilibrium.

Từ khóa


Tài liệu tham khảo

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The Royal Society

Tập 208 Số 1092

63-75

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