Knowledge Bank

The symmetric stretch vibration $(3055.07723(63)cm-1)$ of chloromethyl radical has been characterized via tunable difference frequency IR absorption spectroscopy in a slit supersonic discharge expansion source with a resolution of $0.0001cm-1$. Rotational progressions for both nuclear spin isomers $(K=0,1)$ and chlorine isotopes are observed and assigned. Rotational analysis and least squares fits to a Watson Hamiltonian have been performed with ground state values were taken from rotational $spectraa$, yielding asymmetric top rotational, centrifugal distortion constants and isotope shifts for the vibrationally excited state. Searches at shot noise limited detection sensitivity have also been performed for the asymmetric C-H-stretch vibration $(3163-3232cm-1)$, confirming theoretical predictions that this band is at least 25 times weaker then the corresponding symmetric stretch vibration.