Determination of Spectral Parameters in Microwave Fouriertransform Spectroscopy by Analysis of Time-Domain Signals

Abstract

Some disadvantages of using the Fouriertransform algorithm to obtain rotational spectra from microwave pulse induced transient signals are demonstrated. To overcome the difficulties, a fitting procedure is suggested which is based on the analysis of time-resolved data.

Centrifugal Distortion Analysis and Study of T 2 -Relaxation for l-Type Doublet Transitions of Nitrous Oxide ( 15N2O) by a Microwave Pulse Technique

“…The agreement between experimental and theoretical values (see Table 1) is indicated by the resulting 1.9 kHz root mean squares deviation of the fit. The fitting of q (3) showed no further improvement.…”

“…Pressure broadening parameters for /-type doublet transitions have been determined rarely [1][2][3][4][5][6] in the microwave region. The investigation of pressure broadening parameters of /-type doubling transitions is useful in addition to the investigation of the selfbroadening of pure rotational lines because these studies provide additional information about rotational relaxation caused by differences of collision-induced energy transfer involved in the two types of transitions.…”

On the Validity of Additivity Rules for the Molecular Magnetizability Tensor and the Molecular g-Tensor in van der Waals Complexes. A Rotational Zeeman Effect Study o f 1,1-Dideutero-Cyclopropane

“…F or the analysis of the observed M ,-patterns we have therefore neglected D-hfs completely. Actually the decay-fit routine [6] used to fit the frequencies to the observed transient emission signals failed to fit the individual triplet components within Mj-satellite but succeeded to optimize the central frequencies of sufficiently iso lated Mj-satellites with no problem. Only such suffi ciently well resolved Mj-satellites (some are presented in Table 1) were used to fit the g-tensor elements g± and fify and the magnetizability anisotropy £ L -^ of cyclopropane, C 3H 6.…”

The Determination of Spin-Rotation and Spin-Spin Interaction Constants from the Microwave Spectrum of Methane

“…More accurate frequencies were obtained by least squares fits of the time domain signals. This method significantly increases the accuracy especially in the case of narrow splittings [3,4], This also holds for splittings between a molecular signal and a perturba tion frequency of non-molecular origin.…”