High-resolution laser spectroscopy and magnetic effect of the (B)over-tilde(2)E ' - (X)over-tilde(2)A(2)' transition of (NO3)-N-14 radical

摘要

Rotationally resolved high-resolution fluorescence excitation spectra of (NO3)-N-14 radical have been observed for the 662 nm band, which is assigned as the 0-0 band of the (B) over tilde E-2' <- (X) over tilde (2)A(2)' transition, by crossing a single-mode laser beam perpendicularly to a collimated molecular beam. More than 3000 rotational lines were detected in 15 070-15 145 cm(-1) region, but it is difficult to find the rotational line series. Remarkable rotational line pairs, whose interval is about 0.0246 cm(-1), were found in the observed spectrum. This interval is the same amount with the spin-rotation splitting of the (X) over tilde (2)A(2)' (nu = 0, k = 0, N = 1) level. From this interval and the observed Zeeman splitting up to 360 G, seven line pairs were assigned as the transitions to the E-2(3/2)' (J' = 1.5) levels and 15 line pairs were assigned as the transitions to the E-2(1/2)' (J' = 0.5) levels. From the rotational analysis, we recognized that the E-2' state splits into E-2(3/2)' and E-2(1/2)' by the spin-orbit interaction and the effective spin-orbit interaction constant was roughly estimated as -21 cm(-1). From the number of the rotational line pairs, we concluded that the complicated rotational structure of this 662 nm band of (NO3)-N-14 mainly owes to the vibronic interaction between the (B) over tilde E-2' state and the dark (A) over tilde E-2 '' state through the a(2)'' symmetry vibrational mode. (C) 2014 AIP Publishing LLC.