Cavity ring down measurement of the (1, 0)B ~2∑~+_u -X~2∑~+_g Absorption band of the N~+_2 cation

摘要

The ultraviolet (1, 0) B ~2∑~+_u -X~2∑~+_g transition in the N~+_2 cation was measured with the absorption cavity ring down technique. The N~+_2 cations were produced in a stationary DC discharge in nitrogen under reduced (≈0.5 Tr) pressure. The weak band due to the (4, 0) A ~2∏u-X~2∑~+_g transi- tion in the red part of the spectrum was also recorded. Several of the observed transitions correspond to absorptions from the vibrationally excited(v'=1) states of N~+_2 and to absorptions from the neutral N_2 molecules in the triplet state.