High-JRotational Transitions of NNO Measured with the NAIR Terahertz Spectrometer

Terahertz Spectroscopy of the Amidogen Radical, NH2

“…In fact, the two radicals occurred simultaneously during the study of the rotational spectrum of NH with the Cologne terahertz spectrometer between ϳ0.90 and ϳ1.01 THz (12). The spectra between ϳ610 and ϳ790 GHz were recorded at the National Insititute for Advanced Interdisciplinary Research (NAIR), Japan with a sub-mmW spectrometer constructed along the design criteria of the Cologne terahertz spectrometer (13).…”

“…At NAIR a millimeter-wave phase-locked Gunn oscillator is used as the local source in the present study instead of the synthesizer (13). The intermediate frequency produced by the mixer-diode is locked at 350 MHz using a phase-lockloop (PLL).…”

“…The MODR data (mostly transitions between the two electron spin components of a given rotational level, but also one electric dipole-allowed rotational transition, 5 23 -6 16 , and one magnetic dipole-allowed rotational transition, 3 31 -4 13 ) were used with their stated uncertainties (mostly 0.5 MHz, in some cases 1 or 2 MHz) (3)(4)(5). Initially, the measured FIR laser sideband lines were given uncertainties of 1 MHz as stated by the authors (9).…”

Submillimeter-Wave Spectra of the SF Radical

“…The terahertz spectrometer at NAIR (8) has been used for the present measurement. The spectrometer has been used for the submillimeter-wave spectra of various molecules in the last few years: the rotational spectra of N 2 O (8, 9), OCS (10), NH 2 OH (11), NH 2 (12), and CF (13) and the tunneling-rotation transition of malonaldehyde (14).…”

Terahertz Measurements of Rotational Transitions in Vibrationally Excited States of N2O

“…Unfortunately not enough frequency measurements have been produced to give accurate values for all the constants needed to obtain calibration data with accuracies in the sub-MHz range. An earlier paper (7) reported the use of the new NAIR terahertz spectrometer for measurements of high J rotational transitions of N 2 O and various isotopomers of N 2 O in the ground state. We have now used the same system to measure a number of rotational transitions of 14 N 14 N 16 O in all vibrational states below 2250 cm Ϫ1 in order to improve the accuracy of the rotational constants for as many of the lower levels as possible.…”