Field Induced Perturbations in the Ultraviolet Spectrum of HCP

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Abstract
Both electric and magnetic field induced perturbations are observed and analyzed for several excited states of HCP. An electric field causes the R(13) line of the Δ13←1Σ+ transition (0010← 0000) to shift nonlinearly. This is interpretted as due to a nearby electronic state with a nonzero transition moment of 0.11±0.02 D with the 3Δ1 state, and the zero-field energy level separation of the rotational sublevel of the two states is 0.04±0.01 cm−1. In the limit that the 3Δ1 state is case (a), it can be shown that Ω must be either 0 or 2 for the perturbing state. In the 0200← 0110 band of the à 1A″← X 1Σ+ transition we observe magnetic field induced deperturbations in the J=8 and 13 levels, which are perturbed in zero field. The zero-field energy separation of the two levels is 0.092±0.005 cm−1 and 0.009±0.005 cm−1, the off-diagonal matrix elements connecting the levels with a perturbing state in zero field are 0.106±0.005 cm−1 and 0.148±0.005 cm−1, respectively. It is also determined that the effective magnetic moment of the perturbing state is 0.68±0.15 and 1.25±0.20 μB for J=8 and 13, respectively. This combined with other evidence indicates that the perturbing state is of 3Σ+ vibronic symmetry with a B value of 0.40±0.02 cm−1 and with splitting constant λ=4.0±1.0 cm−1.