Millimeter Wave Spectrum of Formaldehyde

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概要

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• A Stark modulation-type spectrograph has been constructed. Millimeter wave klystrons are used as the power source. The sensitivity of the spectrograph is about 2×10^<-7>cm^<-1> at 70 Gc, when the spectral lines are displayed on a cathode-ray oscilloscope with a sweep rate of 1 cps. R-branch transitions 1_<01>←0_<00> of the formaldehyde isotopic species H_2C^<13>O, H_2CO^<18>, HDCO, D_2CO, D_2C^<13>O and D_2CO^<16> have been measured and their rotational constants have been determined. The observed inertia defects of D_2CO, H_2C^<13>O and H_2CO^<16> are shown to be in good agreement with the predicted theoretical values. From the observed rotational constants the γ_z structures of formaldehyde are determined to be H_2CO γCO=1.2078±0.003A, γCH=1.1161±0.007A, ∠HCH=116°31'±40' D_2CO γCO=1.2078±0.003A, γCD=1.1117±0.007A, ∠DCD=116°37'±40'. It is shown that small difference between the γ_z-structures of different isotopic species is not negligible. This effect has been taken into consideration in the determination of the molecular structure.

• 社団法人日本物理学会の論文
• 1963-08-05

著者

• OKA Takeshi

  Department of Astronomy and Astrophysics, University of Chicago

• TAKAGI Kojiro

  Department of Physics,Toyama University

• Oka Takeshi

  Department Of Chemistry Faculty Of Science University Of Tokyo

• Takagi Kojiro

  Department Of Physics Faculty Of Science University Of Tokyo

• Oka Takeshi

  Department Of Astronomy And Astrophysics Department Of Chemistry And Enrico Fermi Institute Universi

関連論文

• Absorption Line Survey of H_3^+ toward the Galactic Center Sources : I. GCS 3-2 and GC IRS3
• Infrared-Radiofrequency Double Resonance in HDCO Using a Zeeman-Tuned 3.5 μm He-Xe Laser
• Microwave Spectrum of Formaldehyde : I. K-type Doubling Spectra
• Microwave Zeeman Effect of Formaldehyde
• l-type Doubling Spectra of HCN and DCN
• Microwave Spectra of Formaldehyde -d_1 -d_2
• Millimeter Wave Spectrum of Formaldehyde
• Microwave Spectrum of BrCN and Dependence of Quadrupole Coupling Constant on the Vibrational State
• Microwave Spectrum of Formaldehyde : III. Vibration-Rotation Interaction
• Microwave Spectrum of Hydrazine
• Stark-Zeeman Effects on Asymmetric Top Molecules, Formaldehyde H_2CO
• Far-Infrared Spectroscopy of LiH using a Tunable Far-Infrared Spectrometer
• 27aYJ-1 Separation and conversion measurement of nuclear spin isomers of C_2H_4 using the 10P44 line of two CO_2 lasers
• Millimeter Wave Spectrum of SO_2
• The EPR Spectrometer for Gaseous Free Radicals in the Three Millimeter Wavelength Region
• Microwave Spectrum of Methylamine
• Dependence of Quadrupole Coupling Constant on the Vibrational State in ICN Molecule
• Microwave Zeeman Effect of Ketene
• Microwave Spectrum of Ethyl Iodide
• Microwave Spectrum of Ethyl Iodide, I.
• Absorption-Line Survey of H^+_3 toward the Galactic Center Sources. III. Extent of Warm and Diffuse Clouds
• Centrifugal Distortion Effects in the Microwave Rotational Spectrum of Formaldoxime
• Zeeman Effect and Stark Zeeman Effect on Formic Acid
• Microwave Spectrum of Formaldehyde : II. Molecular Structure in the Ground State

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