NQRS database

Many common materials contain nitrogen or one of the many other nuclei from which NQR can be measured [38], Fortunately, Resonances are narrow in NQR and are dispersed over a very large bandwidth so that NQR signals from benign materials do not interfere with the detection of explosives. Based on an NQR database of more than 10 000 compounds [39], no NQR frequencies from benign materials are found within the typical detection bandwidth of an NQR system when it is set to the frequency of any of the explosives detected by NQR. 

Tel. 81-3-5978-3601, 81-3-5978-3622, fax 81-3-5978-3600 Quantum Chemistry Literature Database with bibliographic information on more than 25,000 papers reporting ab initio atomic and molecular calculations since 1978. Distributed on magnetic tape searching software runs on FACOM, HITAC, Hitachi, Sony, Hewlett-Packard, IBM, Silicon Graphics, Sun, and VAX. NQRS database with nuclear quadrapole resonance speara NQRS PC SEARCH software. PCs. 

Almost all quadrupolar nuclei in the Periodic Table have been studied experimentally in one or more of their compounds. A current list 0f these results is available in a database published by the JAICI (Japan Association for International Chemical Information, Tokyo, Japan). Biennial International Symposia on nuclear quadrupole interactions are also excellent sources of the latest experimental and theoretical works. As an illustration of the kind of solid-state problems that may be studied, we give some recent examples of such investigations. Sensitivity. or signal-to-noise ratio (SNR) in WQR spectroscopy, as well as NMR, depends on the observed frequency, which in turn, depends, inter alia, on the value of Q. The lighter elements tend to have low values of Q and low NQR frequencies and low sensitivities. for example, a... 

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