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British Chemical Abstracts ------A.-Pure Chemistry

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British Chemical Abstracts ------A.-Pure Chemistry BRITISH CHEMICAL ABSTRACTS ------------------ ------------- A.-PURE CHEMISTRY OCTOBER, 1934. General, Physical, and Inorganic Chemistry. o Origin of anomalous displacements in the 46, 124—129).—Radiations corresponding with energy Stark effect of hydro gen. W. S t e u b i n g and P. differences between terms have been found, and new Ja k el (Z. Physik, 1934, 90, 112—132). lines of Kr ix and Xe ix are predicted. N. M. B. A. B. D. C. Spectrum of nickel hydride. A. G. G a y d o n and Demonstration of the axiality of light emission R. W . B. P e a r s e (Naturę, 1934, 134, 287).—Details of the ultra-violet hydrogen lines 1025 and of a spectrum attributed to the mol. NiH are given. 1215 A. R. F r e r i c h s and H. B o m k e (Physikal. Z., L. S. T. 1934, 35, 549—551).—For the 1025 A. line, with Spectrum of zinc. L. B l o c h and E. B l o c h (J. parallel emission, the ratio of the intensity of the long- Phys. Radium, 1934, [vii], 5, 289—298).—The spark wave to that of the short-wave component is 1 :2 . spectrum in vac. revealcd the new Zn iv order of < An approx. val. of 1:1-5 is obtained for opposite 120 lines in the rangę 4000—2500 A. The high- emission. For the 1215 A. line, the components have freąuency electrodeless discharge allowed the separ- the same intensity in both parallel and opposite ation of the orders Zn n, gm ng < 50 new lines, Zn i i i , emission. A. J. M. and Zn iv. Data for about 800 lines are tabulated. Nuclear spin of deuterium. G. M . M u r p h y and N. M. B. (Miss) H. J o h n s t o n (Physical Rev., 1934, [ii], 46, Band spectrum of Se,. E. O l s s o n (Z. Physik, 95—98).—Determination of the alternating intensities 1934, 90, 138—144).—Bańds near 3700 and 3900 A. in emission of the Av=0 seąuence of the Fulelier were investigated; Se80 has no nuclear spin. bands leads to a nuclear spin of unity. N. M . B. A. B. D. C. Second spark spectrum of tellurium. S. G. Direct proof of the existence of metastahle K rishnamurty (Naturę, 1934,134, 255).—Thefunda- molecules in active nitrogen. J. K a p ł a n (Naturę, mental intervals 5paP0—5-p3Pv C>psP 2—5pzP2, and 1934, 134, 289).—The bands 2760-6 and 2603-8 A. 5p3P2—5pD\ are 4751, 3410, and 9198 cm.-1, respec- appear in the N afterglow and provide direct proof of tively. The cale. third ionisation potential of Te is the existence in it of metastable mols. L. S. T. approx. 29-5 volts. L. S. T. Situation of the A (3S ) level in the nitrogen Excitation and ionisation of mercury atoms in molecule. E. T. S . A p p l e y a r d , N. T h o m p s o n , and columns of the rare gases containing mercury. S. E. W il l ia m s (Naturę, 1934, 134, 322—323). F. M. P e n n i n g (Pliysica, 1934, 1, 763—769).—From L. S. T. spectrograms of the positive columns of the rare gases Measurements of intensity distribution and at a pressure of 10 mm. and at 0° and 19°, in presence width of predissociation lines of the A1H mole­ and absence of Hg, it is concluded that at 19° the cule. II. H. C. B u r g e r and P .H . v a n C it t e r t (Z. positive ions are mainly Hg+ formed by direct electron Physik, 1934, 90, 70).—Polemical against Farkas and collision, whilst at 0° excitation of rare gases is Levy (this vol., 823). A. B. 1). C. necessary. H. S. P. Further band systems of aluminium hydride. Initial stages of spark discharges in gases. W. H o l s t (Naturę, 1934,134,322).—The band system H. J. W h it e (PhysicalRev., 1934, [ii], 46, 99—106).— at 4950 A. (this vol„ 715) belongs to a 1S*** — > 1~ Using the electro-optical shutter, a study in N2, H2, transition. L. S. T. 0 2, C02, He, and A at atm. pressure and gaps < 1 cm. shows four types of spark breakdown cliaracterised by Continuous emission spectra of atomie origin. the appearance and growth of luminous streamers; G. B a l a s s e (J. Pliys. Radium, 1934, [yii], 5, 304— the velocity of the latter in H2 and N„ is approx. 107 308).—Spectra excited by electrodeless discharge have cm. per sec., agreeing with calc. electron velocities been photograplied for the ncutral atoms of K, Rb, under breakdown conditions. Resultsindicate that the Cs, Zn, Hg, P, As, Bi, S, and I, and for the ionised current at breakdown is carried mainly by electrons, atoms of Hg, S, and I. Properties and mechanism of wliich come from the cathode rather than from ionis­ emission are discussed. The coincidence of certain ation in the gas. The space charges causing break­ lines with the continuous spectrum is explained by down arise from differences in mobility velocity of anomalous dispersion (see this vol., 935). ^ electrons and positive ions. N. M. B. Deepest terms in ions of the isoelectronic Interior radiation of the electric arc. T. sequences Ni I to Kr IX and Pd I to Xe ix . P. G. P e c z a l s k i (Compt. rend., 1934, 199, 405— 407).— Using hollow C electrodes it has been shown that the K rug er and W. E. S h o u p p (Physical Rev., 1934, [n], 3 z 1051 1052 BRITISH CHEMICAL ABSTRACTS.— A. spectrum of the internal layers of an arc salted with ation of K[l' from K{iy was obtained for Fe203 and CaF2 includes Ca, C, N2, and 0 2 bands, whilst the radi- FeS. Displacement of the K$1 lines of the compound ation from the exterior consists principally of CąF2 relative to that of the pure element was detectcd bands. J. W. S. especially for FeS2. With Fe and the other compounds Thermal mechanism in the column of the arc. investigated AX for the K ol doublet is 4, whereas FeS2 has the corresponding AX 3-82. W. R. A. L. S. O r n s t e i n and H. B r in k m a n (Physica, 1934, 1, 797—824).—Theoretical. The formation and destruc- Quadrupole lines in the K series of ruthenium. t-ion of excited particles in the ordinary arc is duo E. W i l h e l m y (Physical Rev., 1934, [ii], 4 6 ,130—132). ehiefły to collisions between atoms and mols. Near the —The Ru Kfi^ (K —NjyNy) and K [i g (K—j\1 iy v) electrodes and at Iow pressures, excitation and ionis- lines have been observed with a double crystal ation due to electron collision may occur, so that the spectrometer; the wave-lengths are 0-55974 and thermal mechanism of the arc changes into the electron 0-56668 A., respectivcly. Kfi- appears to be a mechanism of the glow discharge. H. S. P. doublet; the widtli of the single components is < 11 Formation of hydrogen in a vacuum. M. volts; K$n is 28 volts. The intensity ratios are: PosEJrAL (Compt. rend., 1934, 199, 186—188; cf. J)Tp4/ira1= l/160, K$5IKa.y= 1 /400. A very faint line this vol., 236, 471).—It has been shown that H2 pre- (7i'P6/iLa1=l/20Ó0) of X 0-558 A. has been observed. existing in the discharge tube cannot account for the N. M. B. development of H2ina vac.during discharge, described Intensity measurements of X-ray spectral previously. Measurable vols. of H2 are developed in a lines. M. B ó t z k e s (Z. Physik, 1934, 89, 667—681). vac. tube which contains 30 thin Pt wires (12 con- —Relative intensities are given for Ta L lines. nected to the cathode and 18 to the anodę), but H2 is A. B. D. C. not developed when the same current is passed but Determination of atomie scattering factors for with no wires in the tube. The vols. produced are .Y-rays in the region of L absorption edges. J. about twiee those which are formed by the same cur­ B r e n t a n o and A. B a x t e r (Z. Physik, 1934, 89, rent during electrolysis, in agreement with the auth'or’s 720—735).—Observations were made for W and Al. theory. J. W. S. A. B. D. C. L Absorption discontinuities of bismuth. Emission of low-penetrating radiatjon by L. H. C a r r (Physical Rev., 1934, [ii], 46, 92—95).- charged insulators. G. R e b o u l (J. Phys. Radium, Using balanced cells containing Bi(N03)3,5H20 in dii. 1934, [vii], 5, 329—343).—Charged insulators emit, in HN03, and dii. HN03, respectively, ^/p was measured losing their charge, a highly absorbable radiation at 20 wave-lengths in the rangę 0-56—1-54 A. Equa- 'which ionises gases, affects a photographie plate, and tions to the branches of the curve and the magnitudes gives rise to invisible phosphorescence phenomena. of discontinuities were deduced. N. M. B. Ćertain anomalies which aro shown by insulators and can be explained by the emission, and the properties, Experiment showing the dark current of naturę, and origin of the radiation are examined and alkali cells due to a glow electron current.
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