Knowledge Bank

The NH-He van der Waals complex was characterized via laser excitation of bands associated with the NH $A3\Pi -X3\Sigma -$ transition. It was demonstrated that the ground state supports a bound level with a rotational constant of $B\prime \prime$= 0.334(2) cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$. These results are in agreement with the predictions of recent high-level theoretical calculations. Spin-orbit predissociation of the excited complex was observed, and the spectra yield insights regarding the NH($A$)+He potential energy surfaces. Features of the OH-He complex have been observed in conjunction with the $A2\Sigma +-$ X$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi$ 0 - 0 transition. The partially resolved bands have been interpreted using the theoretical results of Lee, McCoy, Toczylowski and Cybulski (JCP, 113, 5736, (2000)).