You may also wish to search for items by Kawamura.
Only one matching reference was found.
Ohno, K.; Kurita, E.; Kawamura, M.; Matsuura, H., Gas-phase infrared spectra of the unstable phosphaalkenes CF2:PH, CF2:PCF3, and CH2:PC: the C:P stretching vibration and force constant, J. Am. Chem. Soc., 1987, 109, 19, 5614, https://doi.org/10.1021/ja00253a009 . [all data]