Hydrogen bromide, absorption spectrum

Huebert, B. J., and R. M. Martin, Gas-Phase Far-Ultraviolet Absorption Spectrum of Hydrogen Bromide and Hydrogen Iodide, J. Phys Chem., 72, 3046-3048 (1968). 

Spectrum.—According to J. Tyndall,18 hydrogen chloride and hydrogen bromide absorb heat rays. W. H. Julius found that hydrogen chloride had an absorption band for the wave-length 3 68[i and K. Angstrom and W. Palmaer at 3 41/u,. W. de W. Abney and E. R. Festing found liquid hydrochloric acid had very feeble absorption lines in the ultra-red at 732, 741, 845, 867, and 949/u/i. 

Goodeve, C.F., and A.C.W. Taylor, The continuous absorption spectrum of hydrogen bromide. Proc Roy Soc A152, 221, 1935. 

Atoms and simple molecules absorb electromagnetic radiation only at certain discrete frequencies, rather than as continuous functions of frequency. For example, Eigure 11.1 shows the infrared absorption spectrum of hydrogen bromide. Discrete absorption frequencies imply discrete energy spacings. This is the basis for quantum mechanics. 

Attempts to carry out a similar sequence of reactions on j8-bromo-cyanolycopodine LIV were thwarted for a long time by the tendency of this compound to eliminate hydrogen bromide. Treatment with potassium acetate in methanol, amines, and other bases always led to the same nonketonic, very unreactive compound, which was eventually shown to be the enol ether LV 41). With silver acetate in benzene, however, LIV yielded a mixture of LV and an acetoxy compound in an approximate ratio of 3 1. Treatment of the acetate in the same sequence of reactions used in the a-series gave the carboxylic acid LVI. When LVI was treated with sodium borohydride and the acidified reaction mixture extracted into chloroform a neutral compound was isolated. In its IR-spectrum it had 1743 cm in Nujol which shifted to 1761 cm i in chloroform solution, but there was no absorption in the hydroxyl region. The IR-speetrum and the elemental analysis were in agreement with the lactone structure LVII. When this work was carried out, however, the IR-evidence alone was not sufficient to differentiate between a y- and a S-lactone ([Pg.331]

Huebert, B.J., Martin, R.M. Gas-phase far-ultraviolet absorption spectrum of hydrogen bromide and hydrogen iodide. J. Phys. Chem. 72, 3046 (1968)... 

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