The nutation frequency of a quadrupolar spin I depends on the quadrupole interaction. From nutation spectra, therefore, one obtains information about the direct surrounding of the atom. The theory of the straightforward and of more complicated nutation N M R experiments is outlined. Two applications of nutation N M R , to 2 3 Na in zeolites and A1 in alumina, are shown. In this way in CaO • 6 A...

Abstract. From the analysis of VLBI observational data compiled by USNO (U.S. Naval Observatory) from MJD 44089.994 to 51618.250 (McCarthy, 2000), we showed that a strong peak around 400 sidereal days in the spectrum of its di erences from the IERS96 nutation theory could be explained by adding a model Free Core Nutation (FCN) term in the form of a single damped oscillation. Then we developed a...

The influence of the rf field inhomogeneity on the NQR nutation spectra of spin / = 3/2 nuclei in powder samples is investigated. To eliminate the rf field inhomogeneity effects, a method of reconstruction of the NQR nutation spectra, based on finding the deconvolution of the Fourier nutation spectrum with a function of the rf field distribution, is used. The method is successfully demonstrated...

The method of random sampling was introduced for the first time in the nutation nuclear quadrupole resonance (NQR) spectroscopy where the nutation spectra show characteristic singularities in the form of shoulders. The analytic formulae for complex two-dimensional (2-D) nutation NQR spectra (I = 3/2) were obtained and the condition for resolving the spectral singularities for small values of an...

Satellite space-geodetic measurements have been used since a long time to determine UT1UTC rates (or length of day values). The estimation of nutation rates (in longitude and obliquity), however, was thought to be reserved to VLBI and LLR. It can be shown, that there is no fundamental difference between the estimation of UT1-UTC rates and nutation rates. Significant contributions to nutation by...

r • Abst.ra.ct! We discuss the formulation of a new nutation series to be used 'in the reduction of modern space geodetic data. The motivation for devel: oping such a series is to develop a nutation series that has smaller short . period errors than the IAU 1980 nutat ion series and to provide a series that can be used wi th techniques such as the Global Positioning System (GPS) eo • that have ...

The effects of off-resonance irradiation in nutation NQR experiments are demonstrated both experimentally and theoretically. The theoretical description of the off-resonance effects in 2D nutation NQR spectroscopy is given, and general exact formulas for the asymmetry parameter are obtained. It is shown that the outcome of the off-resonance nutation experiments depends on the data acquisition p...

Analysis of over 20 years of very long baseline interferometry data (VLBI) yields estimates of the coefficients of the nutation series with standard deviations ranging from 5 micro-arc-seconds (mas) for the terms with periods less than 400-days to 38 mas for the longest period terms. The largest deviations between the VLBI estimates of the amplitudes of terms in the nutation series and the theo...

The report of the IAU Working Group on Nutation endorsed by Commissions 4, 8, 19 and 31 at the 1979 General Assembly points out that "... the complete theory of the general nutational motion of the Earth about its center of mass may be described by the sum of two components, astronomical nutation, commonly referred to as nutation, which is nutation with respect to a space-fixed coordinate syste...

The total precession in longitude for a solid-core, rigid Mars model is found to be A^ = — 7!'296 + 0".01\ yr~ \ This precession includes the motion resulting from the extremely longperiod (> 10 000 yr) nutation components that result from changes in Mars' orbit with time. These same very long-period nutation components also contribute a "precession" in latitude of A£ = 0''4255 + 0!'0012 yr" ^ ...