Josef Lindenmayer

Diode laser spectroscopy of the ν4 band of benzene

Abstract Sections of the ν 4 band of benzene near 674 cm −1 have been recorded under conditions of Doppler-limited resolution using a diode laser spectrometer. In contrast to earlier measurements on this parallel band both the J and the K structures were resolved and this has enabled a number of band parameters to be determined accurately for the first time. The set of ground state constants determined from these data are compared with those determined by J. Pliva and A. S. Pine ( J. Mol. Spectrosc. 93 , 209–236 (1981)) using a difference frequency laser system.

The equilibrium structure of disulfur monoxide: Diode laser spectroscopy of ν1 and ν3 of S218O and ν3 of S216O

Abstract Diode laser spectroscopy of ν 1 and ν 3 of 32 S 2 18 O and ν 3 of 32 S 2 16 O has been carried out and several hundred transition frequencies were measured with a nominal accuracy of ±0.001 cm −1 . These data have been combined with earlier microwave and diode laser measurements to produce accurate rotational and distortion constants for the (0, 0, 0), (1, 0, 0), and (0, 0, 1) vibrational states of both isotopic species. These results were combined with microwave data from (0, 1, 0) of both isotopes to allow and equilibrium structure for S 2 O to be calculated.

Laser spectroscopy of sulfur dioxide: The ν1 band of 32S16O18O and the ν3 band of 32S18O2

Abstract The combination of data obtained from infrared-microwave double resonance with those from pure rotational spectroscopy has allowed a full set of constants for the ν 1 band of S 16 O 18 O to be determined. Tunable diode laser spectroscopy has been carried out on the ν 3 band of S 18 O 2 and 112 transitions were measured with a nominal accuracy of ±0.001 cm −1 . Band constants have been determined from these data.

Diode laser spectroscopy of the ν3 band region of four isotopic forms of CS2

Abstract The diole laser spectrum of a natural sample of the linear molecule, CS 2 , has been measured in the region 1450–1550 cm −1 . An absolute frequency calibration of approximately 0.001 cm −1 was achieved by measuring CS 2 absorption lines relative to those of H 2 O and HDO and using the absolute wave numbers of Guelachvili [ J. Opt. Soc. Amer. , 73, 137–150 (1983)]. Band constants were determined for the following: C 32 S 2 ; (0, 0, 1) ← (0, 0, 0), (0, 1 1 , 1) ← (0, 1 1 , 0), (0, 2 0,2 , 1) ← (0, 2 0,2 , 0), (1, 0, 1) ← (1, 0, 0); 34 SC 32 S; (0, 0, 1) ← (0, 0, 0): 33 SC 32 S; (0, 0, 1) ← (0, 0, 0): 13 C 32 S 2 ; (0, 0, 1) ← (0, 0, 0).

The diode-laser spectrum of the ν1 band of disulfur monoxide

Abstract The frequencies of approximately 460 transitions of the ν1 band of the unstable molecule S2O have been measured with an accuracy of ±0.001 cm−1 using a diode-laser spectrometer. Effective constants for this band were produced by carrying out a least-squares fit on the infrared data plus 112 ground-state rotational transitions.

The ν1 bands of 32S18O2 and 34S18O2 from infrared-microwave double resonance

Abstract Effective band constants for the ν 1 bands of both 32 S 18 O 2 and 34 S 18 O 2 have been determined from infrared-microwave double resonance spectroscopy. These results allow conclusions to be drawn over the processes involved in previously reported experiments with CO 2 lasers and oxygen-18 samples of SO 2 .

Diode laser spectroscopy of lithium chloride at elevated temperatures

Abstract Diode laser spectroscopy of lithium chloride in the gas phase (850°C) has been carried out in the region 621 to 693 cm −1 . Transitions of three isotopic combinations of lithium chloride ( 7 Li 35 Cl, 7 Li 37 Cl and 6 Li 35 Cl) have been measured with a nominal accuracy of ± 0.001 cm −1 . The results were combined with existing microwave data and fitted to the usual Dunham equation to produce accurate values of the pure vibrational parameters ( Y 10 , Y 20 , etc.) and a number of high-order parameters.

The rs structure of disulfur monoxide: the microwave spectrum of S218O

Abstract In a novel flow system 95 at.% enriched S 2 18 O was produced and the microwave spectrum in the states (0, 0, 0) and (0, 1, 0) was observed. The resulting constants together with the data already published allowed the complete r s structure of S 2 O to be determined.

The ν1 fundamental and associated hot bands of three isotopic forms of cyanogen fluoride by diode laser spectroscopy

Abstract Diode laser spectroscopy measurements have been carried out in the ν 1 band (CF stretch) region of three isotopic forms of cyanogen fluoride (normal FCN, FC 15 N, and F 13 CN). Wave-numbers of infrared transitions were determined with a nominal accuracy of ±0.001 cm −1 , and were combined with all the available microwave data to produce constants for the bands (1, 0, 0) ← (0, 0, 0), (1, 1 1 , 0) ← (0, 1 1 , 0), (1, 2 0 , 0) ← (0, 2 0 , 0), and (1, 2 2 , 0) ← (0, 2 2 , 0) for normal FCN and FC 15 N, and (1, 0, 0) ← (0, 0, 0) and (1, 1 1 , 0) ← (0, 1 1 , 0) for F 13 CN.

Diode laser spectrum of HCCF in the region of the ν3 fundamental band: A combined analysis of infrared and microwave spectra

Abstract The high-resolution IR spectra of fluoroacetylene, HCCF, and its deuterated species, DCCF, were measured with a diode laser spectrometer in the range from 1020 to 1094 cm−1 for the ν3 fundamental band. In addition, a combination band of the two bending modes, ν4 + ν5, was recorded for HCCF in the range from 938 to 967 cm−1. The transitions of the two 13C species of HCCF, i.e. H13CCF and HC13CF, in natural abundance were identified in the ν3 band. The spectra were analyzed by using the effective Hamiltonian of Yamada, Birss, and Aliev (J. Mol. Spectrosc. 112, 347–356 (1985)) together with the available rotational spectra in the microwave and millimeter-wave region.