Lowest Overtone and Combination Levels of DCCI: The Fermi Resonance v3 = 1/v5 = 2.
The infrared spectrum of deuterated monoiodoacetylene DCCI in the region of 220-550 cm-1 has been studied at a resolution of 0.0020 cm-1. The hot bands nu3 <-- nu15 and 2nu0,25 <-- nu15 have been analyzed by considering especially the Fermi resonance v3 = 1/v5 = 2. In the next layer of the hot bands (nu3 + nu5)1 <-- nu3, (nu3 + nu5)1 <-- 2nu0,25 and 3nu1,35 <-- 2nu25 the same Fermi resonance appears between v3 = v5 = 1 and v5 = 3. In addition, various l resonances at the overtone levels have been considered. As a result, the vibrational and rotational constants for the level systems v3 = 1/v5 = 2 and v3 = v5 = 1/v5 = 3 together with the resonance parameters have been obtained. Copyright 1999 Academic Press.
High-resolution infrared study on DCCI: harmonic force field of monoiodoacetylene
Abstract A high-resolution infrared spectrum of DCCI has been measured in the regions of the bands of 2ν1, ν1+ν2, ν2+ν3, ν2+ν4, ν2+ν5, and ν4+ν5. Using these bands together with the spectra measured previously, the rovibrational states of 2ν1, ν1+ν2, ν1+ν3, ν1+ν4, ν1+ν5, ν1+2ν5, ν2+ν3, ν2+ν4, ν2+ν5, ν2+2ν5, ν3+ν4, ν4+ν5, and ν4+2ν5 have been analyzed. Various l-type and Fermi resonances have been taken into account in the analysis. In addition, the weak Coriolis resonance between the levels υ3=υ4=1 and υ4=2 has been considered. Accurate values for the molecular constants and the appropriate resonance parameters have been obtained. The unperturbed normal vibrational frequencies associated to the equilibrium state have been calculated for both isotopic species HCCI and DCCI. Then the harmonic force constants for monoiodoacetylene have been determined.
DESIGN CONSIDERATION TO PPM KLYSTRONS FOR INDUSTRIAL LINAC
Toshiba has been developing the C-band and X-band Periodic Permanent Magnet (PPM) focused klystron in collaboration with KEK and manufactured prototypes for the JLC project. [1] The PPM klystron has an advantage to enhance the total efficiency as a result of eliminating the electric power for the focusing magnet. From experience on the development the PPM focused klystrons for the JLC project, we plan to apply the PPM focused klystron to the medical and industrial linac. The periodic magnet focusing scheme has some technical difficulties such as stop band voltage. To design the PPM klystron for the medical and industrial linac, it is necessary to give heed to electron beam instability; so that the tube parameters of the PPM focused klystrons have some constraints. The size of the accelerator system is substantially reduced if a PPM focused klystron is used. The majority of medical and industrial linacs use frequencies of S-band range. We discuss the availability of the S-band PPM focused klystron in this paper.