High resolution overtone spectroscopy of the acetylene van der Waals dimer, (12C2H2)2
Abstract
CW-cavity ring down sub-bands and effective rigid rotor vibration–rotation constants were obtained by simultaneously fitting 1CH and 2CH lines with the same symmetry series. Perturbations affecting the Ka stacks, in particular, are reported. The tunneling frequency in 2CH is estimated to be ν2CHtunn = 270 MHz for the Ka = 0 stack. The rotational temperature is determined to be 23 K from relative line intensities and the lifetime of the dimer in the 2CH hat state is estimated to be 1 ns from individual line widths.
- This article is part of the themed collection: Weak hydrogen bonds – strong effects?