High-resolution Fourier transform infrared spectra of the CH3 ν3and CH2D ν4 bands

2001 ◽  
Vol 79 (2-3) ◽  
pp. 449-459 ◽  
Author(s):  
K Kawaguchi
Keyword(s):  
Fourier Transform ◽  
Vibrational Mode ◽  
Fourier Transform Infrared ◽  
Centrifugal Distortion ◽  
Molecular Constants ◽  
Out Of Plane ◽  
Infrared Spectrometer ◽  
Splitting Constant ◽  
Centrifugal Distortion Constants ◽  
First Time

The spectrum of the ν3 band CH3 was observed in the 2800–3100 cm–1 region with a Fourier transform infrared spectrometer. The 76 observed lines were analyzed together with the previous difference frequency data to determine the molecular constants including sextic centrifugal distortion constants and the A1 – A2 splitting constant in the ground state. The ν4 band (out-of-plane vibrational mode) of CH2D was observed in the 550–700 cm–1 region by a discharge in a mixture of CH2DI and Ar. The molecular constants in both the ground and the ν4 states of this radical have been determined for the first time. PACS No.: 33.20Ea

The Centrifugally Induced Pure Rotational Spectrum and the Structure of Sulfur Trioxide. A Microwave Fourier Transform Study of a Nonpolar Molecule

1991 ◽  
Vol 46 (8) ◽  
pp. 710-714 ◽  
Author(s):  
Volker Meyer ◽  
Dieter Hermann Sutter ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Sulfur Trioxide ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Nonpolar Molecule ◽  
Centrifugal Distortion Constants ◽  
First Time

AbstractThe pure rotational spectrum of sulfur trioxide has been observed for the first time. A total of 25 high-J transitions could be assigned. The rotational constants, two quartic centrifugal distortion constants, and three sextic centrifugal distortion constants were determined as: B= 10 449.0667(23) MHz, C = 5216.0330(12) MHz, DJ = 9.2651 (18) kHz, DJK = -16.3922(18) kHz, HJ, = -8.8(34) • 10-3 Hz, HJK= -15.8(73) • 10-3 Hz, and HKJ = 34.2(73) • 10-3 Hz. An r0- and an re -structure are presented: r0= 1.4198(7) Å (calculated from B), r0 = 1.4210(7) Å (calculated from C), and re = 1.4175 Å

High-Resolution Infrared Spectrum of Diazirine, H2CN2. Rovibrational Analysis of the Methylene Deformation Band

1988 ◽  
Vol 43 (4) ◽  
pp. 331-337 ◽  
Author(s):  
A. Gambi ◽  
A. Baldacci ◽  
S. Giorgianni
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Least Squares ◽  
Deformation Band ◽  
Fourier Transform Spectrometer ◽  
Centrifugal Distortion ◽  
Molecular Constants ◽  
Centrifugal Distortion Constants

Abstract The infrared spectrum of diazirine has been recorded at Doppler resolution with a high informa­tion Fourier transform spectrometer. The ν3 fundamental has been reinvestigated and the overall assignment of the rovibrational transitions has been carried out. From the least-squares analysis a more accurate set of molecular constants including the sextic centrifugal distortion constants has been determined for the level υ3 = 1 and will be reported here. The higher resolution achieved here allowed the assignment of weaker lines and many Q branch transitions. Moreover many blended lines have now been resolved and could be properly assigned.

HIGH-RESOLUTION FOURIER TRANSFORM INFRARED SPECTRUM OF THE ν2 + ν12 BAND OF ETHYLENE (12C2H4)

COSMOS ◽  
2013 ◽  
Vol 09 (01) ◽  
pp. 29-35
Author(s):  
G. B. LEBRON ◽  
T. L. TAN
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Asymmetric Reduction ◽  
Infrared Absorption Spectrum ◽  
Fourier Transform Infrared ◽  
Mean Square ◽  
Mean Square Deviation ◽  
Centrifugal Distortion ◽  
Band Center ◽  
Centrifugal Distortion Constants

The high-resolution Fourier transform infrared absorption spectrum of the ν2 + ν12 combination band of normal ethylene (12 C 2 H 4) in the 3050–3105 cm-1 region was recorded at a resolution of 0.0063 cm-1 and at an ambient temperature of 296 K. Upper state rovibrational analysis was carried out using a standard Watson's Hamiltonian in asymmetric reduction in Ir representation. The band center, rotational constants and centrifugal distortion constants up to quartic terms of the upper ν2 + ν12 = 1 state were determined from the final fit that included 102 infrared transitions. The root-mean-square deviation of the fit was 0.000729 cm-1.

Fourier transform infrared spectroscopy of the BH3 ν2 band

1994 ◽  
Vol 72 (11-12) ◽  
pp. 925-929 ◽  
Author(s):  
K. Kawaguchi
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Standard Deviation ◽  
Diode Laser ◽  
Fourier Transform Infrared ◽  
Interaction Constant ◽  
Molecular Constants ◽  
Coriolis Interaction ◽  
Laser Spectrum ◽  
Infrared Spectrometer

The spectrum of the BH3 ν2 band was observed in the 900–1300 cm−1 region with a Fourier transform infrared spectrometer. The borane molecule was produced with a discharge in a B2H6 and He mixture. The observed spectrum was analyzed by including the Coriolis interaction from the ν4 state to determine the molecular constants in the ν2 and ν4 states. The band origins and the Coriolis interaction constant were determined to be ν2 = 1147.4986 (12), ν4 = 1196.66 (12), and D24 = 7.8034 (48) cm−1, with one standard deviation in parentheses. The previous Q-branch assignment of the diode laser spectrum was partly revised.

Analysis of Captan on Nitrile Glove Surfaces Using a Portable Attenuated Total Reflection Fourier Transform Infrared Spectrometer

2005 ◽  
Vol 59 (6) ◽  
pp. 724-731 ◽  
Author(s):  
R. N. Phalen ◽  
Shane S. Que Hee
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Surface Films ◽  
Airflow Rate ◽  
Infrared Spectrometer ◽  
Ftir Spectrometer ◽  
Selection Of ◽  
Solvent Volume

This study developed a method to produce uniform captan surface films on a disposable nitrile glove for quantitation with a portable attenuated total reflection Fourier transform infrared (ATR-FTIR) spectrometer. A permeation test was performed using aqueous captan formulation. Uniform captan surface films were produced using solvent casting with 2-propanol and a 25 mm filter holder connected to a vacuum manifold to control solvent evaporation. The coefficient of variation of the reflectance at 1735 ± 5 cm−1 was minimized by selection of the optimum solvent volume, airflow rate, and evaporation time. At room temperature, the lower to upper quantifiable limits were 0.31–20.7 μg/cm2 ( r = 0.9967; p ≤ 0.05) for the outer glove surface and 0.55–17.5 μg/cm2 ( r = 0.9409; p ≤ 0.05) for the inner surface. Relative humidity and temperature did not affect the uncoated gloves at the wavelength of captan analysis. Glove screening using ATR-FTIR was necessary as a control for between-glove variation. Captan permeation, after 8 hours exposure to an aqueous concentration of 217 mg/mL of Captan 50-WP, was detected at 0.8 ± 0.3 μg/cm2 on the inner glove surface. ATR-FTIR can detect captan permeation and can determine the protectiveness of this glove in the field.

33S Nuclear Hyperfine Structure in the Rotational Spectrum of Thiazole

1993 ◽  
Vol 48 (12) ◽  
pp. 1219-1222 ◽  
Author(s):  
U. Kretschmer ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Molecular Beam ◽  
Microwave Spectroscopy ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

Abstract We investigated the 33S nuclear quadrupole coupling of thiazole- 33S in natural abundance by molecular beam Fourier transform microwave spectroscopy. In addition the 14N nuclear quadrupole coupling could be analyzed with high precision. We derived the rotational constants A = 8529.29268 (70) MHz, B = 5427.47098 MHz, and C = 3315.21676 (26) MHz, quartic centrifugal distortion constants and the quadrupole coupling constants of 33S χaa = 7.1708 (61) MHz and χbb= -26.1749 (69) MHz and of 14N χ aa = -2.7411 (61) MHz and χbb = 0.0767 (69) MHz.

A Fourier Transform Infrared Method of Studying Elastomers Filled with Carbon Black

1977 ◽  
Vol 31 (3) ◽  
pp. 220-224 ◽  
Author(s):  
W. W. Hart ◽  
P. C. Painter ◽  
J. L. Koenig ◽  
M. M. Coleman
Keyword(s):  
Fourier Transform ◽  
Carbon Black ◽  
Fourier Transform Infrared ◽  
General Purpose ◽  
Attenuated Total Reflection ◽  
Furnace Black ◽  
Infrared Spectrometer ◽  
Infrared Method ◽  
Principal Method ◽  
Transmission And Reflection

Infrared spectra have been obtained of carbon black filled polybutadiene using a Fourier transform infrared spectrometer. Transmission and reflection techniques were employed. Polybutadiene was compounded with three fillers: Silene, general purpose furnace black, and Austin black. Subtle changes were observed in the vibrations of polybutadiene upon the addition of fillers. Transmission sampling through dilution with KBr gave better spectra than attenuated total reflection techniques in ease of data acquisition, and was therefore chosen as the principal method for further studies.

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