Projects / Programmes source: ARIS

Nove metode za detekcijo jedrske kvadrupolne resonance N-14 (Slovene)

Research activity

Code Science Field Subfield
1.02.01  Natural sciences and mathematics  Physics  Physics of condesed matter 

Code Science Field
1.03  Natural Sciences  Physical sciences 
Evaluation (rules)
source: COBISS
Researchers (7)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  07518  PhD Tomaž Apih  Physics  Head  2009 - 2012  266 
2.  29523  PhD Anton Gradišek  Physics  Junior researcher  2009 - 2012  444 
3.  18272  PhD Alan Gregorovič  Physics  Researcher  2009 - 2012  99 
4.  17288  Davorin Kotnik    Technical associate  2009 - 2012 
5.  22317  PhD Andrija Lebar  Pharmacy  Researcher  2009 - 2010  68 
6.  01117  PhD Janez Seliger  Physics  Researcher  2009 - 2012  342 
7.  07071  Veselko Žagar    Technical associate  2009 - 2012  154 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,322 
Significance for science
The measurements of nuclear quadrupole coupling constants 14N are important from the standpoint of basic science as well as for applications. We have developed a new technique for the determination of very weak quadrupole coupling constants by using dynamic proton polarization. This should enable measurements on systems, which have not been accessible by the standard NQR methods. This advance in the experimental field is even more important due to the simultaneous advance of computational methods in the solid-state systems. This allows for a direct experimental verification of theoretical models by NQR. We have theoretically explained the off-resonance effects when using multipulse excitation techniques. This should enable the development of even more efficient algorithms for the robust extraction of signals from noise. We have also developed a new method a new probe, which enables the NQR measurements on thin layers on conducting surfaces. This should further widen the range of applicability of our method.
Significance for the country
The results of the research program include: - a new and more sensitive double resonance method for the detection of quadrupole resonance frequencies - as improvement of the detection of nitrogen based substances (such as forbidden drugs or explosives) by NQR. - new way of measuring NQR signal originating from thin layers on conducting surfaces We expect that the results will find their use in the pharmaceutical analysis in the following areas: 1. Identification of polymorphic structures The 14N NQR spectroscopy is extremely selective. The polymorphic structures often exhibit quite separated resonance frequencies and which enables to determine the proportions of various phases even in the powder form. 2. Qualitative and quantitative analysis The intensity on NQR signal is proportional to the quantity of the sample in the given form. Additional ingredients in the sample usually don't modify the resonance frequencies. 3. Detection and quality control in all production stages NQR does not require magnet, so remote measurements are quite possible. For example, it should be possible to nondestructively check the presence of a drug in an unopened box of tablets. 4. The development of NQR methods can be directly used also in the field of remote detection of illicit substances, illegal drugs and explosives, which is being actively developed by the J. Stefan Institute group. The developed analytical methods are available to the Slovenian pharmaceutical industry which will potentially improve its competitive advantage. We also expect a significant improvement for the remote detection of explosives, which could lead to explosive detection devices for military and civil use.
Most important scientific results Annual report 2009, 2010, 2011, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2009, 2010, 2011, final report, complete report on dLib.si
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