The Infra‐Red Spectrum of C2H6
dc.contributor.author | Smith, Lincoln G. | en_US |
dc.date.accessioned | 2010-05-06T22:53:31Z | |
dc.date.available | 2010-05-06T22:53:31Z | |
dc.date.issued | 1949-02 | en_US |
dc.identifier.citation | Smith, Lincoln G. (1949). "The Infra‐Red Spectrum of C2H6." The Journal of Chemical Physics 17(2): 139-167. <http://hdl.handle.net/2027.42/70901> | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/70901 | |
dc.description.abstract | The infra‐red spectrum of C2H6 gas has been studied in the region between 1.6 and 13μ with a spectrometer of high resolving power. From measurements on four resolved ∥ bands the value IB0 = (42.234±0.011)×10−40 g cm2 has been obtained for the large moment of inertia in the ground state. From measurements on the three fundamental ⊥ bands the best value at present available for the small moment of inertia is IA = 10.81×10−40 g cm2. Because of uncertainties concerning the perturbations of degenerate state ν8, of which a semi‐quantitative explanation which is apparently basically correct has been obtained, this value is provisional but appears to be fairly reliable. With these values of IB0 and IA, if one assumes C☒C = 1.55A, one obtains C☒H = 1.098A and ≰HCC = 109° 3′. From the considerations of the perturbations of state ν8 and of the frequencies and line spacings of the combination ⊥ bands, spectroscopic evidence indicating that the configuration of C2H6 is staggered (point group D3d) has for the first time been obtained. Also from these considerations the reliable value ν8 = 1472.2 cm−1 and the values ν4 = 290 cm−1 for the torsion frequency and ν12 = 1190 cm−1 for the ``uncertain'' frequency have been obtained. The latter two values are perhaps somewhat more reliable and not inconsistent with values obtained previously by other methods. These and other results are summarized in Figs. 1 and 14 and in Tables XII—XV. | en_US |
dc.format.extent | 3102 bytes | |
dc.format.extent | 2757448 bytes | |
dc.format.mimetype | text/plain | |
dc.format.mimetype | application/pdf | |
dc.publisher | The American Institute of Physics | en_US |
dc.rights | © The American Institute of Physics | en_US |
dc.title | The Infra‐Red Spectrum of C2H6 | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Physics | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Palmer Physical Laboratory, Princeton, New Jersey, and University of Michigan, Ann Arbor, Michigan | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/70901/2/JCPSA6-17-2-139-1.pdf | |
dc.identifier.doi | 10.1063/1.1747206 | en_US |
dc.identifier.source | The Journal of Chemical Physics | en_US |
dc.identifier.citedreference | L. G. Smith and W. M. Woodward, Phys. Rev. 61, 386A (1942). | en_US |
dc.identifier.citedreference | G. Herzberg, Infrared and Raman Spectra of Polyatomic Molecules (D. Van Nostrand Company, Inc., New York, 1945). | en_US |
dc.identifier.citedreference | Reference 2, p. 342. | en_US |
dc.identifier.citedreference | The staggered configuration is also favored by the recent theoretical considerations of E. N. Lassettre and Laurence B. Davis (J. Chem. Phys. 16, 151 (1948)). | en_US |
dc.identifier.citedreference | L. G. Smith, Rev. Sci. Inst. 13, 54, 63 and 65 (1942). | en_US |
dc.identifier.citedreference | In the case of Fig. 2b the curve was replotted from the original photograph which was marred by bad zero drift. Hence in this figure the dashed zero line is straight and horizontal. | en_US |
dc.identifier.citedreference | C. F. Meyer and A. Levin, Phys. Rev. 34, 44 (1929). | en_US |
dc.identifier.citedreference | G. Herzberg, Molecular Spectra and Molecular Structure I. Diatomic Molecules (Prentice‐Hall Inc., New York, 1939), p. 60. | en_US |
dc.identifier.citedreference | Here, as elsewhere in this report, the notation is essentially that used throughout references 2 and 8, the subscript 0 instead of the superscript ″ is used on rotational constants of the ground state and J ≡ J″.J≡J″. | en_US |
dc.identifier.citedreference | J. B. Howard, J. Chem. Phys. 5, 442 (1937). | en_US |
dc.identifier.citedreference | J. W. M. DuMond and E. R. Cohen, Rev. Mod. Phys. 20, 82 (1948). | en_US |
dc.identifier.citedreference | Jahn’s rule, cf. reference 2, p. 276 and Tables 20, 22 and 31. | en_US |
dc.identifier.citedreference | A. Levin and C. F. Meyer, J. Opt. Soc. Amer. 16, 137 (1928). | en_US |
dc.identifier.citedreference | J. B. Howard, J. Chem. Phys. 5, 451 (1937). | en_US |
dc.identifier.citedreference | R. G. Owens and E. F. Barker, J. Chem. Phys. 10, 146 (1942). The wave number values reported by these authors are systematically lower than those in Table I by about 0.1 cm−1.0.1cm−1. | en_US |
dc.identifier.citedreference | E. Bartholomé and J. Karweil, Zeits. f. Physik. Chemie B39, 1 (1938). | en_US |
dc.identifier.citedreference | S. L. Gerhard and D. M. Dennison, Phys. Rev. 43, 197 (1933). | en_US |
dc.identifier.citedreference | It is assumed here that the energies of each set of levels are represented by a single‐valued function of K in which K is taken positive for +l levels+llevels (transitions to which give rise to RQRQ lines) and negative for −l levels−llevels (cf. reference 2, p. 403). | en_US |
dc.identifier.citedreference | H. H. Nielsen, Phys. Rev. 60, 794 (1941). | en_US |
dc.identifier.citedreference | Cf. reference 2, p. 429 and footnote 9. | en_US |
dc.identifier.citedreference | L. Pauling and L. O. Brockway, Jr., J. Am. Chem. Soc. 59, 1223 (1937). | en_US |
dc.identifier.citedreference | The ζ value of a combination state and hence ΔνΔν of the corresponding band are independent of what non‐degenerate vibrations are excited in the state. (Cf. reference 30 below.) | en_US |
dc.identifier.citedreference | It is possible that the group of lines 5 to 13 of Fig. 10 near 3217 cm−13217cm−1 whose spacings are rather irregular, but roughly the same as for the band at 3257.8 cm−1,3257.8cm−1, corresponds to a combination of ν4ν4 and another component of ν10.ν10. | en_US |
dc.identifier.citedreference | S. Bhagavantam, Ind. J. Phys. 6, 596 (1931) and B. L. Crawford, Jr., W. H. Avery, and J. W. Linnett, J. Chem. Phys. 6, 682 (1938). | en_US |
dc.identifier.citedreference | G. Glockler and M. M. Renfrew, J. Chem. Phys. 6, 295 (1938). | en_US |
dc.identifier.citedreference | G. B. Kistiakowsky, J. R. Lacher and F. Stitt, J. Chem. Phys. 7, 289 (1939). | en_US |
dc.identifier.citedreference | F. Stitt, J. Chem. Phys. 7, 297 (1939). | en_US |
dc.identifier.citedreference | Herzberg (reference 2, p. 405) citing Howard (see reference 14), who does not consider this sum, erroneously states that this sum is zero. | en_US |
dc.identifier.citedreference | We speak in this section of the ΔνΔν of a band even though such a band is inactive. | en_US |
dc.identifier.citedreference | M. Johnston and D. M. Dennison, Phys. Rev. 48, 868 (1935). | en_US |
dc.identifier.citedreference | W. H. Avery and C. F. Ellis, J. Chem. Phys. 10, 10 (1942). | en_US |
dc.identifier.citedreference | Very weak absorption near 1216 cm−11216cm−1 has been observed under low dispersion by Avery and Ellis (see reference 31) and attributed by them to band ν11−ν4.ν11−ν4. | en_US |
dc.owningcollname | Physics, Department of |
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