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Berlin Brandenburg

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  • 1
    Language: English
    In: The Journal of Chemical Physics, 15 December 1983, Vol.79(12), pp.5887-5893
    Description: Irradiation into either of the two resonance transitions of Cr atoms in Kr matrices results in strong bleaching of the atomic absorptions and simultaneous growth of two Cr 2 dimer bands. The lower energy band of Cr 2 at ∼470 nm is the well‐known 1 Σ + u  →  1 Σ + g transition. The higher energy band at ∼340 nm we assign to the 1 Π u  ←  1 Σ + g transition which occurs at almost the same energy as, and is therefore obscured by, the y 7 P 0  ←  a 7 S transition of normally present Cr atoms in Kr (and Ar) matrices. Laser induced fluorescence from the ∼470 nm band gives a broad, featureless emission presumably because of extensive predissociation after cage relaxation of the excited 1 Σ + u state. Emission after excitation of 1 Π u  ←  1 Σ + g transition yields a four member progression with spacing of ∼240 cm − 1 . The spectrum is consistent with emission from a 3 Σ g ‘‘trap’’ level to a lower lying 3 Σ u state, ∼8000 cm − 1 above ground. An energy level diagram of the Cr 2 molecule is presented which incorporates all of the spectroscopic information available on the dimer.
    ISSN: 0021-9606
    E-ISSN: 1089-7690
    Source: © 1983 American Institute of Physics (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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