Abstract
The absorption spectrum of diborane has been investigated in the infra‐red from 1–25μ and in the vacuum ultraviolet down to 1000A. The rotational structure obtained for certain of the infra‐red bands rules out the ethane‐type structure but agrees very well with the interpretation of the electron diffraction results in terms of a bridge model. The ultraviolet spectrum indicates a simple electronic structure and a first ionization potential about 11–12 volts.

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