The Microwave Spectrum of Fluoroacetylene in Ground and Vibrationally Excited States and Some Laser Enhancement Effects

Abstract

The microwave spectrum of HCCF and DCCF has been investigated in all vibrational states with energy up to 1500 cm ^-1 . In the ground state and low-lying vibrational states mm-wave measurements up to 210 GHz were made. In some cases a detailed analysis of the vibrational state rotation spectrum including the effects of l-type resonance, and the determination of the anharmonicity constant g_tt was possible. The rotational spectra of combination states of the type (v_t = 2, v_t′ = 1) were observed and partially analyzed, which is, to our knowledge, the first time this has been accomplished. The low-lying vibrational states of ¹³ C species of HCCF and DCCF were also observed. The 9.4 μm P(14) CO₂-laser line was observed to produce a reduction in intensity in the ground state and an increase in intensity in the v₃ = 1 excited state J = 0 → 1, 1 → 2, 2 3 transitions of DCCF.