Mikko Huhanantti

The infra-red spectrum of C2D2 in the region of the bending fundamental v 5

The absorption spectrum of C2D2 in the region of the bending fundamental v 5 has been studied at a resolution better than 0·03 cm-1. In addition to the fundamental, all the hot bands starting from the levels v 4 and v 5 have been investigated. Several molecular parameters have been derived. Special attention has been paid to illustrate the analysis of the effects of the l-type resonances on the vibrational levels 2v 5 and (v 4 + v 5). The fundamental v 5 of the isotopic molecule 12C 13CD2 has also been observed.

Fermi resonance in the spectrum of deuterated monofluoroacetylene

Abstract A strong Fermi resonance interaction between two Σ-type levels ν2 and 2ν3 of DCCF together with the corresponding resonance between the levels ν2 + ν3 and 3ν3 has been observed. The rotational structure of the bands has been investigated in both the diads which are situated around 2100 and 3100 cm−1. The molecular constants involved have been derived.

The spectrum of HCCF around 2200 cm−1

Abstract The i.r spectrum of HCCF in the region of the CC stretching vibration ν2 around 2200 cm−1 has been studied. The fundamental ν2 has been found to be in Fermi resonance with 2ν3, the overtone of the CF stretching band. The rotational structure of the bands has been investigated and the molecular constants involved have been derived.

Investigation of the ν1 and 2ν1 Infrared Bands of Monofluoracetylene

The rotational structures of the ν1 and 2 ν1 infrared bands of monofluoroacetylene were investigated. The values B0=0.32374±0.00005 cm-1 and 0.32372±0.00010 cm-1, respectively, were obtained. In addition, the analysis of the fundamental gave α1= (6.85±0.15) × 10-4 cm-1 and D0= (15±3) × 10-8 cm-1. Theoretically, the centrifugal disortion constant was computed to be 13 × 10-8 cm-1. The hot bands accompanying the fundamental were also studied.

High resolution infrared spectrum of the ν4 band of DCCF

Abstract The bending vibration-rotation band ν 4 of DCCF was studied. The measurements were carried out with a Fourier spectrometer at a resolution of about 0.03 cm −1 . The constants B 0 =0.29141(1)cm −1 , α 4 =−5.02(2)×10 −4 cm −1 , q 4 =4.52(3)×10 −4 cm −1 , and D 0 =9.2(4)×10 −8 cm −1 were derived. The rotational analysis of the “hot” bands 2ν 4 (Δ) ← ν 4 (II) and 2ν 4 (Σ + ) ← ν 4 (II) was performed. In addition, the “hot” bands ν 4 + ν 5 ← ν 5 were assigned. A set of vibrational constants involved was derived.