Abstract
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 Cr2 dimer bands. The lower energy band of Cr2 at ∼470 nm is the well-known 1Σ+u → 1Σ+g transition. The higher energy band at ∼340 nm we assign to the 1Πu ← 1Σ+g transition which occurs at almost the same energy as, and is therefore obscured by, the y7P0 ← a7S 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 1Σ+u state. Emission after excitation of 1Πu ← 1Σ+g transition yields a four member progression with spacing of ∼240 cm−1. The spectrum is consistent with emission from a 3Σg ‘‘trap’’ level to a lower lying 3Σu state, ∼8000 cm−1 above ground. An energy level diagram of the Cr2 molecule is presented which incorporates all of the spectroscopic information available on the dimer.
References
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Dates
| Type | When |
|---|---|
| Created | 22 years, 6 months ago (Feb. 28, 2003, 12:03 p.m.) |
| Deposited | 1 year, 6 months ago (Feb. 9, 2024, 8:44 p.m.) |
| Indexed | 1 year ago (Aug. 2, 2024, 9:10 a.m.) |
| Issued | 41 years, 8 months ago (Dec. 15, 1983) |
| Published | 41 years, 8 months ago (Dec. 15, 1983) |
| Published Print | 41 years, 8 months ago (Dec. 15, 1983) |
@article{Pellin_1983, title={Emission, ground, and excited state absorption spectroscopy of Cr2 isolated in Ar and Kr matrices}, volume={79}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.445758}, DOI={10.1063/1.445758}, number={12}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Pellin, M. J. and Gruen, D. M.}, year={1983}, month=dec, pages={5887–5893} }