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  • 1
    Electronic Resource
    Electronic Resource
    Detection of acrolein in engine exhaust with microwave cavity spectrometer of stark voltage sweep type (1975)
    s.l. : American Chemical Society
    Environmental science & technology 9 (1975), S. 153-154 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60100a005
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  • 2
    Electronic Resource
    Electronic Resource
    Microwave spectroscopic detection of dichlorosilylene SiCl2 in the ground state (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2102-2107 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave spectrum of dichlorosilylene SiCl2 has been observed to characterize this molecule of chemical interest. The molecule was generated by the thermal reaction between silicon powder and tetrachlorosilane at about 1000 °C. The rotational constants and the centrifugal distortion constants were determined for the three isotopic species Si35Cl2, Si35Cl37Cl, and Si37Cl2. The nuclear quadrupole coupling constants were determined from triplet hyperfine splittings observed for several transitions. The asymmetry of the Cl nuclear quadrupole coupling tensor was found to be very large and was accounted for by π electron backdonation from Cl to Si.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457070
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave spectrum of the boron monosulfide radical BS (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2296-2299 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave spectrum of the most abundant isotopic species of the boron monosulfide radical 11B32S in the ground electronic state X 2Σ+ has been observed with a glow discharge cell spectrometer. Boron monosulfide was produced in an absorption cell by a glow discharge through a gaseous mixture of boron trichloride and hydrogen sulfide. The transitions were observed for N=2–1 to N=7–6 which fell in the frequency region up to 332 GHz. The molecular parameters were derived by a least-squares analysis: these included the rotational and centrifugal distortion constants, the spin–rotation interaction constant, the magnetic hyperfine interaction constants, and the nuclear quadrupole interaction constant. The nuclear spin-rotation interaction constant was also determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454064
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  • 4
    Electronic Resource
    Electronic Resource
    Microwave spectroscopic study of the SiF3 radical: Spin-rotation interaction and molecular structure (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 9242-9247 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The trifluorosilyl radical has been produced by glow discharge in hexafluorodisilane in a free space cell. The rotational spectrum of the radical has been measured from the 330 (N=22−21) GHz region down to the 90 (N=6−5) and 75 (N=5−4) GHz regions. In the lower N transitions the K=1 hyperfine components showed a distinct splitting. From the splitting of the K=1 lines it was concluded that the spin-rotation interaction constant of trifluorosilyl radical has a positive sign, which is different from that of trifluoromethyl. This difference is discussed in terms of the electronic states. The simplified discussion based on the Mulliken–Walsh diagram of the energy level is used to rationalize the difference in the sign of the interaction constants in the two radicals. The Si–F bond length is determined from the rotational constant B0 to be 1.565 Å when the bond angle F–Si–F is assumed to be 109.9° deduced in the matrix infrared spectroscopy. The spin density on the fluorine atoms is derived from the hyperfine coupling constants. The obtained molecular structure is compared with those of related molecules. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479838
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave spectrum and molecular structure of PNO (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 3012-3017 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave spectra of P14N16O and its isotopomers P15N16O and P14N18O were observed in a dc glow discharge plasma of a mixture of nitric oxide and hydrogen gases over solid red phosphorus placed on the stainless steel electrode. Rotational transitions of the parent P14N16O species were measured in the ground state as well as in the vibrationally excited ν1 (PN str.), ν2 (bend), and 2ν2 states. The l=0 substate of the 2ν2 state interacts with the ν1 state through a Fermi resonance. The rotational constants determined for the ground states of the three isotopomers yield the substitution structure, rs(PN)=151.6516(87) pm and rs(NO)=119.5025(80) pm. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479582
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  • 6
    Electronic Resource
    Electronic Resource
    Microwave spectrum of the NI radical in the X 3Σ− ground state (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 6345-6349 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of the NI radical in the X 3Σ− ground electronic state has been observed by a source modulated spectrometer with a free space cell. The NI radical was generated in the cell by a dc (direct current) glow discharge in a mixture of iodine vapor with N2 and He. A rotational transition consisted of a group of congested lines resulting from the hyperfine interactions due to both iodine and nitrogen nuclei. The molecular constants including the spin–spin and spin–rotation coupling constants and the magnetic and nuclear quadrupole hyperfine interaction constants were determined by the least-squares analysis. The spin density of the unpaired electrons was estimated from the observed hyperfine coupling constants to be 76.8% and 23.4% on the nitrogen and the iodine atoms, respectively. The quadrupole coupling constant was related with the difference in electronegativity of the two bonded atoms. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479938
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  • 7
    Electronic Resource
    Electronic Resource
    Antitumor Principles in Mosses: the First Isolation and Identification of Maytansinoids, Including a Novel 15-Methoxyansamitocin P-3 (1988)
    s.l. : American Chemical Society
    Journal of natural products 51 (1988), S. 845-850 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50059a005
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  • 8
    Electronic Resource
    Electronic Resource
    Millimeter-wave spectroscopy of chromium monochloride (CrCl) (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 3501-3507 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of chromium monochloride in the 6Σ+ ground electronic state has been observed with a source-modulated microwave spectrometer in the millimeter-wave region. The CrCl radical was produced in a free space absorption cell by a dc glow discharge in a mixture of AlCl3 vapor and He using stainless steel electrodes. Chromium atom was supplied from the electrodes by the sputtering reaction. Observed spectral lines were analyzed by a least-squares fit and the molecular constants including the rotational and centrifugal distortion constants and the spin-spin and spin-rotation interaction constants were determined. The experimental rotational constants B0 for 52Cr35Cl and 52Cr37Cl are 5 009.345 69(69) and 4 847.851 00(32) MHz, respectively, where the uncertainties attached to the last digit correspond to one standard deviation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476945
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  • 9
    Electronic Resource
    Electronic Resource
    Microwave spectroscopy of the NBr radical in the X 3Σ− state (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 7169-7175 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave spectrum of the NBr radical in the X 3Σ− ground electronic state has been observed by a source modulated spectrometer. The NBr radical was generated in a free space cell by a dc glow discharge in a mixture of N2, Br2, and He. The spectrum with three spin components of both two isotopomers, N79Br and N81Br, was observed. The spectrum showed complicated splitting by the hyperfine interactions due to both bromine and nitrogen nuclei. The molecular constants including the magnetic hyperfine and nuclear quadrupolar hyperfine interaction constants were determined by analyzing the observed spectrum. The spin density of the unpaired electrons was estimated from the observed hyperfine coupling constants to be 73.4% and 22.4% on the nitrogen and the bromine atoms, respectively. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477354
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  • 10
    Electronic Resource
    Electronic Resource
    The rotational spectrum of the CrF radical in the X 6Σ+ state (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 7421-7424 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of the CrF radical in the X 6Σ+ state was observed by employing a source modulation microwave spectrometer. The CrF radical was generated in a free space cell by a dc glow discharge in CF4 and He. The chromium atom was supplied by the sputtering reaction from chromium powder placed over a lower surface of the cylindrical electrodes. The transitions with N=12−11 to 20−19 were measured in the region between 270 and 460 GHz. The rotational, centrifugal distortion and several fine-structure constants were obtained by a least squares analysis. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472608
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