Hashi, Tsuneo

Ogawa, Toru

Okaya, Akira

Takahashi, Isao

Kyoto University Research Information Repository

Title On the 1.5cm Wave Length Microwave Absorption Spectrumof CH₃BrAuthor(s)Takahashi, Isao; Okaya, Akira; Ogawa, Toru; Hashi, TsuneoCitation京都大学化学研究所報告 (1950), 22: 76-76Issue Date1950-09-30URL http://hdl.handle.net/2433/74149RightType Departmental Bulletin PaperTextversionpublisherKyoto University        11. On the  1.5  cm Wave Length Microwave                 Absorption Spectrum of CH3Br.  Isao Takahashi,  Akira Okaya, Toru Ogawa and  Tsuneo Hashi.    With our  1.5  cm microwave spectroscope, we observed the rotational transition  J. K. (0,  0)—J• K. (1, 0) of CH3Br79 and  CH3Br81. The absorption frequencies were measured with the cylindrical cavity wave meter operating in TE011 mode and our results are summarized in the following table in comparison with the theoretical values.          Absorption frequencies of CH3Br79 (ground vibrational state)      Transition Freq.  (obs.)  Mc/s Freq.  (theo.)  Mc/s F=3/2--4/2 18994 18992 3/2—.3/2 19262 19252  3/2—.5/2 19103 19108 v0=19197  Mc/s          Absorption frequencies of  CH3B8' (ground vibrational state)      Transition Freq.  (obs.)  Mc/s Freq. (theo.)  Mc/s  F=3/2-4/2  18960 18943 3/2—.3/2  19170 19160  3/2—.5/2 19068 19040  v0=19064  Mc/s where v0 is the frequency of the unsplit rotational line. These satellite structures are caused by interaction of the nuclear quadrupole moment of Br with the molecular field.    Thus we checked our set within the error of our frequency measurement. Our cavity wave meter can only afford the  measurement to the accuracy of ±10 Mc/s at 1.5 cm wave length.    We gave up the intensity comparison among absorption lines, because of the difficulty in adjusting all circuit components for each line, and especially for the lines lying not in the same electronic tuning range of klystron, and further the output power of klystron can not be kept constant without necessary procedure over the range of electronic tuning.            12. On the Production of 1 cm Wave.      Isao Takahashi, Akira Okaya, Toru Ogawa and Tsuneo Hashi.    We used klystron 2K25 for the production of fundamental wave of 3 cm wave length.    We succeeded to convert it to 1 cm energy, where the frequency converter consisted of ridge type wave guide, coaxial line and silicon crystal detector as in the case of our 1.5 cm wave length microwave spectroscope.    This 1 cm wave is intended to  he used for microwave spectroscopy.  C  76

On the 1.5cm Wave Length Microwave Absorption Spectrum of CH₃Br

http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/74149/1/chc022_076_1.pdf

On the 1.5cm Wave Length Microwave Absorption Spectrum of CH₃Br

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