Abstract
The ν4 fundamental band (CO2 antisymmetric stretching mode) of the FCO2 radical in the ground electronic state X˜2B2 has been recorded by Fourier-transform infrared spectroscopy at an effective resolution of 0.003cm−1 between 1040 and 1130cm−1. FCO2 was generated by vacuum flash pyrolysis at about 350°C of FC(O)OO(O)CF. More than 3300 ro-vibrational transitions have been assigned, which involved levels with N′ up to 56 and Ka′ up to 38. The observed Doppler-broadened spectrum was analyzed to yield accurate values of the band origin (1094.142210(27)cm−1, one standard error in parentheses), the rotational constants, the quartic centrifugal distortion constants and electron spin-rotation interaction parameters in the v4=1 state. Large variations of the centrifugal distortion parameters ΔK (+26%), ΔNK (−1463%) and δK (−10%) upon excitation of the ν4 vibration have been observed.
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