High-resolution spectroscopy of the ν6 and ν8 bands of formic acid

Analysis of High-Resolution FTIR Spectrum of the ν6Band of H13COOH

“…A set of rotational constants, all five quartic centrifugal distortion and three sextic distortion, for the v 6 ϭ 1 state were determined. The band center for 6 was found to be 1095.403646 Ϯ 0.000030 cm Ϫ1 . An rms deviation of 0.00047 cm Ϫ1 for the 3004 transitions was achieved.…”

“…An rms deviation of 0.00047 cm Ϫ1 for the 3004 transitions was achieved. Figure 3 shows the deviation of the perturbed lines after the final fit and Table 2, available as supplementary data, shows the observed transitions of 6 and their deviations of the final fit.…”

“…This could be due to the weak intensity of the 8 band. However, it was found that an optimum fit of 6 could be acquired if the rotational constants A and B and the band origin of 8 were allowed to float. Other indeterminable parameters were fixed at the ground state values.…”

The Coriolis-Coupled Statesv7= 1 andv9= 1 oftrans-HCOOD andtrans-DCOOD

“…The extracted very accurate data were later combined with FT measurements (resolution 0.01 cm Ϫ1 ) spanning the full absorption band and supplemented by diode laser spectra (resolution 1 ϫ 10 Ϫ3 cm Ϫ1 ) of the 8 Q branch. Parameters of the v 6 ϭ 1 and v 8 ϭ 1 states and the Coriolis coupling coefficient 6,8 a were determined (27). The study that is most closely related to the present work is that by Deroche et al who investigated the 7 and 9 bands of HCOOH by FT spectroscopy (28).…”

Rovibrational Analysis of ν2 and 2ν5 Bands of DCOOH by High Resolution FTIR Spectroscopy

“…Accurate ground state constants were further derived (8). However, high-resolution infrared measurements were limited to the 5 band of DCOOH (10).…”