Optical–Optical Double Resonance Spectroscopy of NO₂ in the 590.1 nm Region

Abstract

Optical–optical double resonance (OODR) spectroscopy has been applied to the rotational and vibronic analysis of the thirty nine eigenstates of NO₂ existing in the energy region of 16,980–17,124 cm^-1 above the ground state. These excited states are concluded to be the mixed states of NO₂ generated by spin-orbit and/or orbital-rotation interaction between the B₂ and A₁ vibronic levels. The mixing mechanism of the excited states is discussed in terms of available information on the visible excited states of NO₂.