A system of physical chemistry - Index of

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A system of physical chemistry - Index of

ABSORPTION SPECTRUM OF WATER VAPOUR 87

region. The validity of the expression can of course be tested by comparison

with actual measurements in the far infra-red where the bands

are due to rotation only. From what has been said above, it follows

that the product

^1 • ^2 . ^T

should be a constant, provided the

theoretical considerations are sound. Making use of some data obtained

by Paschen in the region 5 to in dft. the case of water vapour,

E. von Bahr has found that the two heads of the double band (due to

molecular rotations compounded with atomic vibration) alter their

relative position in accordance with the above expression.

/c.

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