ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • ASTROPHYSICS  (6)
Collection
Keywords
Years
  • 1
    facet.materialart.
    Unknown
    Laboratory detection of the C5H radical (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The new linear molecule reported by Cernicharo et al. (1986) has been found in the same laboratory discharge in which C3H is observed, establishing conclusively that the molecule is C5H in its 2Pi ground state. Six rotational transitions in the 2Pi(1/2) ladder and four in the 2Pi(3/2), each split by lambda doubling, were observed. The twenty millimeter-wave lines were simultaneously fit by a standard Hamiltonian with five free parameters: the fine-structure constant, the rotational constant, the centrifugal distortion constant, and two lambda-doubling constants.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 164; 1, Au; L5
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    The rotational spectrum of the C3H radical (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The rotational spectrum of the recently discovered C3H radical in both fine-structure ladders of its electronic ground state (X2Pi) with lambda doubling and hyperfine structure has been determined to high accuracy, and the strongest transitions at frequencies less than 376 GHz are tabulated. Recently published spectroscopic constants derived from astronomical and laboratory data (Gottlieb et al., 1985) allowed calculation of the spectrum to a radial velocity of 0.4 km/s at frequencies less than 200 GHz, the uncertainties above being somewhat larger. The hyperfine constants of the sequence of four hydrocarbon radicals CH, C2H, C3H, and C4H are briefly described.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 303; 446-450
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Laboratory detection of the C3H radical (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Millimeter-wave lines of the C3H radical, including six of the lines observed in space, were detected in a laboratory glow discharge through a flowing mixture of C2H2, He, and CO. Each of the 10 rotational transitions measured, five between 98 and 185 GHz in the 2Pi1/2 ladder and five between 80 and 194 GHz in the 2Pi3/2 ladder, is split by lambda-type doubling, and all but three possess resolved hyperfine structure. The excellent agreement between the fine-structure, rotation, lambda-doubling, and hyperfine constants derived from the laboratory data and from the astronomical observations conclusively confirms the identifications in IRC +10216 and TMC-1 by Thaddeus and colleagues (1985). An accurate set of spectroscopic constants, which allow calculation of the entire radio spectrum of C3H to a radial velocity of 0.1 km/s, was derived from a simulataneous fit to the laboratory frequencies and to the well-resolved hfs observed in the narrow-line astronomical source TMC-1.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 294; L55-L58
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Laboratory detection of the C3N an C4H free radicals (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The millimeter-wave spectra of the linear carbon chain free radicals C3N and C4H, first identified in IRC + 10216 and hitherto observed only in a few astronomical sources, have been detected with a Zeeman-modulated spectrometer in laboratory glow discharges through low pressure flowing mixtures of N2 + HC3N and He + HCCH, respectively. Four successive rotational transitions between 168 and 198 GHz have been measured for C3N, and five rotational transitions between 143 and 200 GHz for C4H; each is a well-resolved spin doublet owing to the unpaired electron present in both species. Precise values for the rotational, centrifugal distortion, and spin doubling constants have been obtained, which, with hyperfine constants derived from observations of the lower rotational transitions in the astronomical source TMC 1, allow all the rotational transitions of C3N and C4H at frequencies less than 300 GHz to be calculated to an absolute accuracy exceeding 1 ppm.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 275; 916-921
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Detection of interstellar ethyl cyanide (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Twenty-four millimeter-wave emission lines of ethyl cyanide (CH3CH2CN) have been detected in the Orion Nebula (OMC-1) and seven in Sgr B2. To derive precise radial velocities from the astronomical data, a laboratory measurement of the rotational spectrum of ethyl cyanide has been made at frequencies above 41 GHz. In OMC-1, the rotational temperature of ethyl cyanide is 90 K (in good agreement with other molecules), the local-standard-of-rest radial velocity is 4.5 + or - 1.0 km/s (versus 8.5 km/s for most molecules), and the column density is 1.8 by 10 to the 14th power per sq cm (a surprisingly high figure for a complicated molecule). The high abundance of ethyl cyanide in the Orion Nebula suggests that ethane and perhaps larger saturated hydrocarbons may be common constituents of molecular clouds and have escaped detection only because they are nonpolar or only weakly polar.
    Keywords: ASTROPHYSICS
    Type: PB-275022 , Astrophysical Journal; vol. 218
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    Laboratory and astronomical measurement of the millimeter wave spectrum of the ethynyl radical CCH (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The N = 0 yields 1 and 1 yields 2 rotational transitions of CCH at 87 and 174 GHz, respectively, have been detected in a laboratory glow discharge in a mixture of He and C2H2. The spectroscopic constants of CCH derived from measurements of the hfs of the transitions agree well with those derived from astronomical observations, confirming the astronomical detection of CCH. As the CCH lines in the Orion Nebula are narrower than the laboratory lines but less certain in rest frequency owing to uncertainty in the radial velocity, the most accurate values for the spectroscopic constants of CCH are obtained from a simultaneous fit of both the laboratory and astronomical data. For the rotation, centrifugal distortion, spin-rotation, and hyperfine constants, respectively, the values found are within 0.006 of 43674.534 MHz, within 0.0008 of 0.1071 MHz, within 0.004 of -62.606 MHz, b = within 0.019 MHz of 40.426, and c is within 0.026 of 12.254 MHz.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 264
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...