No abstract

We present experimental evidence of enhancement of second-harmonic generation as a result of an increase of the fundamental-field energy density within a multilayer structure near the photonic band edge.

No abstract

The microwave spectrum of methyl cyanide is critically reviewed for iilf~rmatjon applics,ble to radio-astronomy. Molecular data such as the derived rotational constants, centrifugal distortion parameters, hyperfine coupling constants, electric dipole moment and molecular structure are tabulated. The observed rotational transitions are presented for the astronomically interesting isotopic forms and the lowest lying vibrational state of methyl cyanide. Calculated rotational transitions are presented for the ground vibrationa.l state of 12CHSI2C14N, lSCH s 12C14N, 12CH s lSC14N, 12CH S 12ClSN, and for the vibrationally excited state V8 of 120Hs12014N.