Line strengths and broadening coefficients for formaldehyde (H(2)CO) near 3.5 microm were measured at room temperature using a tunable IR diode laser. Because of the extremely narrow linewidth of the laser ( approximately 10(-3) cm(-1)), the transitions were recorded at a resolution limited only by collision and Doppler broadening. The spectral parameters were determined from Voigt line shape fits to R and Q branch rotational-vibrational transitions of the nu(5) band between 2867 and 2881 cm(-1). Line strength measurements were made on both pure and dilute samples of H(2)CO. Pressure broadening of H(2)CO lines by N(2) was measured in mixtures containing 0.8-1.2% H(2)CO.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/AO.27.003219 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
High Resolution Rovibrational Spectroscopy of the ν and ν + ν Bands of HCCCH.
J Phys Chem A
December 2024
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany.
Article Synopsis
- The molecular ion HCCCH was studied using a cryogenic ion trap and leak-out spectroscopy at very low temperatures (4 K).
- For the first time, high-resolution measurements were obtained for the fundamental ν band (antisymmetric H-C-H stretch) and the combination band ν + ν (C≡C stretch and CH rock).
- This research, supported by advanced quantum chemical calculations, significantly improved the accuracy of the rotational constant for HCCCH by seventy times compared to previous studies.
High-resolution ro-vibrational and rotational spectroscopy of HCO.
Phys Chem Chem Phys
July 2023
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany.
The ro-vibrational and pure rotational spectra of the linear ion HCO have been investigated in a 4 K cryogenic ion trap instrument. For this, a novel action spectroscopic technique, called leak-out-spectroscopy (LOS, Schmid , 2022, , 8111), has been utilized and characterized. In total, 45 ro-vibrational transitions within the fundamental band of the C-H stretching mode were measured with a band center at 3237.
View Article and Find Full Text PDFAggregation induced spectral splitting and Fermi resonance of Ethylene Carbonate in binary mixture.
Spectrochim Acta A Mol Biomol Spectrosc
November 2022
College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China. Electronic address:
The vibration band of the ring stretching (ν), the fundamental ring breathing (ν) and the Fermi resonance band of carbonyl stretching mixing with the overtone of the ring breathing (ν 2ν) have been investigated in solid ethylene carbonate (EC) and EC/CHCN and EC/CHCl binary mixture. Dimer structure with aggregation-induced spectral splitting model (AIS) was applied to calculate the vibration spectra using the B3LYP-D3/6-311+G (d,p) procedure. The noncoincidence effect (NCE) and concentration induced frequency shifts of the ν and ν could be well explained by AIS model based on the dimer structure.
View Article and Find Full Text PDFSpectral Signatures of Hydrogen Thioperoxide (HOSH) and Hydrogen Persulfide (HSSH): Possible Molecular Sulfur Sinks in the Dense ISM.
Molecules
May 2022
Department of Earth and Environmental Sciences, University of Pennsylvania, Philadelphia, PA 19104, USA.
For decades, sulfur has remained underdetected in molecular form within the dense interstellar medium (ISM), and somewhere a molecular sulfur sink exists where it may be hiding. With the discovery of hydrogen peroxide (HOOH) in the ISM in 2011, a natural starting point may be found in sulfur-bearing analogs that are chemically similar to HOOH: hydrogen thioperoxide (HOSH) and hydrogen persulfide (HSSH). The present theoretical study couples the accuracy in the anharmonic fundamental vibrational frequencies from the explicitly correlated coupled cluster theory with the accurate rotational constants provided by canonical high-level coupled cluster theory to produce rovibrational spectra for use in the potential observation of HOSH and HSSH.
View Article and Find Full Text PDFIncreasing the weights in the molecular work-out of - and -formic acid: extension of the vibrational database deuteration.
Phys Chem Chem Phys
November 2020
Institute of Physical Chemistry, University of Göttingen, Tammannstr. 6, 37077 Göttingen, Germany.
The higher-energy cis- as well as the global minimum trans-rotamers of the four H/D isotopologues of the formic acid monomer have been examined with Raman jet spectroscopy extending the vibrational gas phase reference database by eleven new cis-band positions for HCOOD, DCOOH, and DCOOD. With these new additions, all O-H/D, C-H/D, and C[double bond, length as m-dash]O stretching as well as the O-D in-plane bending vibrations of these higher-energy rotamers are known in addition to the previously determined C-O stretch and OH torsion of cis-HCOOH. Further, a comparison of the vibrational spectra of all four H/D isotopologues of the globally stable trans-rotamer of formic acid is shown to be very helpful in revealing similarities and differences in these systems, particularly with regard to Fermi resonances.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!