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  • 1
    Electronic Resource
    Electronic Resource
    Electronic spectroscopy of jet-cooled iron monocarbide. The 3Δi←3Δi transition near 493 nm (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 4046-4051 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the first gas phase spectroscopic study of iron monocarbide. FeC molecules were generated in a laser vaporization molecular beam source and detected by laser induced fluorescence. Twenty-six vibronic bands have been recorded in the 430–500 nm region. Rotational analyses have been carried out for 22 of the bands. There are three lower states involved, two with Ω″=2 and one with Ω″=3. Based on our experimental observations and the ab initio calculations on RuC [Shim et al. J. Phys. Chem. 91, 3171 (1987)] the observed bands are interpreted as 3Δi←3Δi and 1Δ←1Δ transitions. The ground state electronic configuration is assigned to 1δ39σ1. Evidence for three excited electronic states (one 3Δi state, one 1Δ state and another state with Ω′=3) and for perturbations in several of their vibrational levels is presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469590
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  • 2
    Electronic Resource
    Electronic Resource
    Laser-induced fluorescence spectroscopy of the A˜ 1Πu–X˜ 1Σ+g transition in jet-cooled C3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 10343-10349 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: C3 radicals have been produced in a plasma of rhenium with methane doped in helium and cooled in a supersonic free jet expansion. More than 50 vibronic bands in the laser induced fluorescence spectrum of the A˜ 1Πu–X˜ 1Σ+g electronic transition have been recorded in the region 370–415 nm at 0.4 cm−1 resolution. The observations include bands identified by Gausset et al. (1965) and many bands not previously characterized. Rotational analyses have been made for a majority of the bands and the number of located Renner–Teller levels of the A˜ state has been considerably extended. The (002) level is tentatively identified. A comparison of the experimentally determined energy level pattern in the A˜ state with theoretical predictions has suggested a number of revisions to previous assignments and evidence is presented to contradict suggestions from earlier work that the (020) level of the A˜ state is perturbed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467914
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  • 3
    Electronic Resource
    Electronic Resource
    The comet-tail (A 2Πi–X 2Σ+) system of 13C18O+ (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3010-3014 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The comet-tail (A2Πi–X2Σ+) system of the molecular ion 13C18O+, excited in the cathode glow of a hollow-cathode discharge tube, was recorded in the spectral region 3620–6165 A(ring). Of the nine bands observed with v'=0 to 5 and v‘=0 to 2, the rotational structure of 8 bands was analyzed. Brown's effective Hamiltonian [J. M. Brown, E. A. Colbourn, J. K. G. Watson, and F. D. Wayne, J. Mol. Spectrosc. 74, 294 (1979)] was used to obtain the molecular constants of the individual bands from their wave number data. By "merging'' the molecular constants thus obtained, a unique set of constants for the X2Σ+ and A2Πi states was obtained. Some of the derived molecular constants of 13C18O+ in units of cm−1 (except re in A(ring)) are: X2Σ+: Be=1.794 28(5), re=1.1156, αe=0.016 66(3), ΔG(1/2)=2082.69; A2Πi: Be=1.441 73(5), re=1.2445, αe=0.016 71(1), ωe=1488.07, ωexe=12.16.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455903
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  • 4
    Electronic Resource
    Electronic Resource
    The Baldet–Johnson (B 2Σ+–A 2Πi) system of 13C18O+ (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1972-1977 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational structure of the 1–0, 0–0, and 0–1 bands of the Baldet–Johnson (B 2Σ+–A 2Πi) system of the molecular ion 13C18O+, excited in the cathode glow of a hollow-cathode discharge tube, was recorded in the spectral region 3700–4225 A(ring) and analyzed. An effective Hamiltonian proposed by Brown et al. [J. M. Brown, E. A. Colbourn, J. K. G. Watson, and F. D. Wayne, J. Mol. Spectrosc. 74, 294 (1979)] was used to obtain the molecular constants from the wave number data of these three bands. These molecular constants were first "merged'' together and the resulting constants were then "merged'' with those of the comet-tail (A 2Πi–X 2Σ+) system of 13C18O+ recently reported by us [C. V. V. Prasad and S. P. Reddy, J. Chem. Phys. 90, 3010 (1989)] to obtain a unique set of constants for the X 2Σ+, A 2Πi, and B 2Σ+ states. Some of the derived constants of 13C18O+ (in cm−1) are for X 2Σ+: Be=1.794 28(4), αe=0.016 61(3), ωe =2110.27(2), and ωexe =13.81(6); for A 2Πi : Be=1.441 92(4), αe=0.016 76(1), ωe =1488.99(2), ωexe =12.454(7), and ωeye =0.0279(8); for B 2Σ+: Be=1.632 62(4), αe=0.025 49(2), ωe=1657.56, and ωexe =27.42.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457647
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