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BRITISH CHEMICAL ABSTRACTS A.-PURE CHEMISTRY FEBRUARY, 1935. General, Physical, and Inorganic Chemistry. Excitation of Balmer series by electrodeless Heat of dissociation of hydrogen molecule discharge. H. N a g a o k a , Y. S u g iu r a , and T. deduced from a new ultra-violet resonance band Mish im a (Proc. Imp. Acad. Tokyo, 1934, 10, 450— sequence. Heats of dissociation of HH2, Hi;, and 451).—Dry II2 was circulated at low pressure through HC1. H. B e u t l e r (Z. physikal. Chem., 1934, B, atube 10 cm. diam., surrounded bya coil of thick wire. 27, 287— 302).—Discharge through A containing Discharges from a 125-kv. transformer of frequency traces of H2 reveals lines due to H2 which constitute C X 106 cycles per sec. were passed between Zn balls. aresonance-band system leading from 2pa1SJ, v' — 10, C. W. G. K' = 2-— ^lsaiS+.v" = 1 -1 4 , 11" = 1 and 3. Excit Influence of the Stark effect on the fine struc­ ation i3 effected by absorption of the A line 1066-4 A. ture of the Balmer lines of hydrogen. N. P. by mols. at the level«" = 2, K" = 1. The extension He y d e n b u r g (Physical Rev., 1934, [ii], 46, 1069— of the scries of vibrations v" by v" = 13 and 14 shows 1075).—The possibility of small electric fields, present the no. of v" vibrational levels to be finite and permits in a discharge tube, accounting for the discrepancies a more exact extrapolation giving heat of dissociation between observed and calc, doublet splitting of the of H2, 102-68 ± 0-12kg.-cal. Thevals. 103-50 ± 0-12, Balmer lines is investigated. Doppler curves are 104-48 i 0-12, and 101-63 ± 0-22 kg.-cal. are calc, plotted for each component and superimposed. For for the heats of dissociation of HH2, H2, and HC1, the Hg line, fields > 100 volts per cm. do not explain respectively. R. C. Houston’s results (cf. A., 1934, 467). A field of 500 Fine structure of H2a. F. H. Sp e d d i n g , C. D. volts per cm. agrees with Gibbs’ results (cf. ibid., 575) S h a n e , and N. S. G r a c e (Physical Rev., 1933, [ii], for H„, but not for H^. N. M . B . 44, 58).— Spectroscopic measurements of H20 con­ Spectrum of the hydrogen molecule. I. The 3, taining 50% HiO show that H1« and H2a are widely 4§?S,n, A— >- 2p3n, and 3s3E— 2p3II systems. separated, each showing its own system of interference 0. W. R ic h a r d s o n and T. B. R y m e r (Proc. Roy. fringes. Preliminary vals. for e/m are < 1-758 X 107 Soc., 1934, A , 147, 24— 47).— Several new bands e.m.u. L. S. T. and a new band system ending on the lowest triplet Spectrum of deuterium ? F. S a n f o r d (Science, state are described. These include : (1) the 1934, 80, 478). L. S. T. 4d3Att— >-2y3n system; (2) the substitution of new Influence of the polarisation of the inner o' ■= 2 and 3 levels for those given by Richardson and electron in the field of the outer [electron] on the Davidson (A., 1933,1219); (3) the non-diagonal lines spectral terms of a two-electron system (especi­ of 4<Z32,11;,, n o, and A&— -> 2^3n ; (4) extension of the ally helium ). G. L u d w ig (Helv. phys. Acta, 1934, 3s3S— >- 2p3n system to the v' — 0, 2, 3, and 4 (?) 7, 273—284; Chem. Zcntr., 1934, ii, 722).—Theoreti­ levels; and (5) extension of the 3c232IIA complex cal. H. J. E. — y 2p3n to the v',v" = 4',4" levels. L. L. B. Inert gas molecules. K. G. E m e l e u s and O. S. Spectrum of H2. II. Band systems due to D u f f e n d a c k (Physical Rev., 1933, [ii], 44, 945).— transitions from four new triplet states to 2Jp3n. The behaviour of the He band spectrum in discharge HI. New bands and band systems ending on tubes carrying small currents indicates that the He 2s3E and an extension of the singlet system mol. is actually produced under discharge conditions lQ ~ 2;>1S. 0 . W. R ic h a r d s o n and T. B. from one normal and one metastable He atom R y m er (Proc. Roy. Soc., 1934, A , 147, 251— 272, according to the scheme H e(l1,3yS) + He(21,3>5)— >- 272—292).—II. Pour new hand systems from He2(21,3S). The possibility of observing the visible hitherto undiscovered upper triplet states to 2jj3II are He band spectrum is closely associated with the described. The consts. and properties of the upper metastability of the 23S level. The band spectra of states are worked out and the possible electronic the mols. Ne2, A2, etc. will be difficult, if not im­ configurations considered. possible, to excite. L. S. T. III. Three new band systems ending on 2s3£ and coming from hitherto undiscovered upper states Li+ fine structure and wave functions near the are described. An account is given of the v' = 0 pro­ nucleus. J. A. W h e e l e r and G. B r e it (Physical gression of the singlet system 1Q— >-2p12, and the Rev., 1933, [ii], 44, 948).—The fine structure of the progression previously known (A., 1929, 616, 731) is (Is 2j>)zP level of Li+ has been calc. L. S. T. shown to be v' = 1. The band consts. and properties Be in lsitp 1P1—ls21S0 series. P. G. K r u g e r ot the upper states are worked out. L. L. B. and F. S. Co o p e r (Physical Rev., 1933, [ii], 44,418).— Jj 135 136 BRITISH CHEMICAL ABSTRACTS.----A. Wave-lengths, term vals., and the series limit are 176).—The absorption spectrum and pleochroism calc. The ionisation potential of Be in is 153-012 of rhombic S between 4000 and 5800 Ä. have been volts. L. S. T. observed for 4 directions of the electric vector of the incident light relative to the crystal axes. The Ionisation potential of Be ill. B. E d l e n differences of the fractional transmissions for (Physical Rev., 1933, [ii], 4 4 , 778).—New investig­ ations confirm the author’s previous val. (A., 1931,539) the various directions are relatively small, despite the for the series limit, which is Is2 1S0 = 1,241,180 cm.4 marked anisotropic structure of the crystals, but the (see above). L. S. T. change in the long wave-length limit of the ultra­ violet absorption exhibits marked variations. Magnetic dipole radiation and the atmo­ H. F. G. spheric absorption bands of oxygen. J. H. Structure of discontinuities in the absorption V a n V l e c k (Astrophys. J., 1934, 8 0 , 161— 170).— of some gases in the region 1 0 —1 0 0 Ä . J. A. The atm. bands of 0 2 are best interpreted as magnetic P r in s (Physica, 1934, 1, 1174—1180; cf. A., 1934, dipole radiation rather than as ordinary dipole or 712).—Measurements for A, CC14, and N2 are recorded quadrupole radiation. L. S. T. and discussed. H. J. E. Regularities in the radiation emitted by the Hyperfine structure of spectrum lines of man­ positive column in the neon discharge. H. ganese arc in vacuum. I. W. M o h a m m a d and K r e f f t and E. 0. Se it z (Physikal. Z., 1934, 35, P. N. Sh a r m a (Phil. M ag., 1934, [ v i i ] , 1 8 , 1144— 1149; 9S0—983).—The spectral energy distribution of the cf. White, A., 1930, 970).— Structure data for 20 lines red Ne lines in the positive column is characteristic in the visible region are reported. N. M. B. and easily reproducible, but the abs. efficiency depends on experimental conditions. A. J. M. Persistence of some lines due to impurities in iron. R. B r e c k p o t and A. M e v is (Ami. Soc. Sei. Widening and displacement of absorption Bruxelles, 1934,5 4 , B, 290—298).— In connexion with lines. C. F u c h t b a u e r [with P. S c h u l z , A. F. quant, spectral analysis, the spectra obtained when B r a n d t , and F . G o ssler ] (Physikal. Z., 1934, 3 5 , known amounts of impurities (Cu, B a , Pb, Bi, Sn, Sb) 975—977).—The displacement of the absorption line in an Fe base are used in the method (A., 1934, 857, of the principal series of K, Na, and Cs up to the 23rd 858> are examined. A. J. M. and 26th members by the addition of He, Ne, and A was investigated. The curves for He and Ne show Hyperfine structure of the arc lines of molyb­ max. in the violet, whilst A produces only red dis­ denum and copper. L. Si b a i y a (Proc. Indian placement. The limiting vals. are the same for Na Acad. Sei., 1934,1, A , 321— 324).—Lines arising from and K. The effective cross-section of He for very slow transitions to the ground state in the arc spectra of electrons obtained from the above data is 15-5 cm.2 Cu and Mo in a Schüler tube are self-reversed, but give per cm.3 The effect of A and He on the width of the correct vals.
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