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1Author    R. Blinc, J. SeligerRequires cookie*
 Title    2 D Methods in NQR Spectroscopy  
 Abstract    The application of two-dimensional spectroscopy to nuclear quadrupole resonance (NQR) is reviewed with special emphasys on spin 3/2 nuclei. A new two-dimensional level crossing double resonance NQR nutation technique based on magnetic field cycling is described. This technique allows for a determination of both the electric quadrupole coupling constant and the asymmetry parameter for spin 3/2 nuclei in powdered samples even in cases where the quadrupolar signals are too weak to be observed directly. It works if the usual double resonance conditions are met, i.e. if the spin-lattice relaxation times are not too short if the quadrupolar nuclei are dipolarly coupled to "strong" nuclei. Variations of this techique can be also used for 2 D "exchange" NQR spectroscopy and NQR imaging. 
  Reference    Z. Naturforsch. 47a, 333—341 (1992); received July 27 1991 
  Published    1992 
  Keywords    2D methods, NQR spectroscopy, Double resonance 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0333.pdf 
 Identifier    ZNA-1992-47a-0333 
 Volume    47 
2Author    W. A. Kreiner, H. Prinz, G. MagerlRequires cookie*
 Title    D a s L a s  
 Abstract    e r -S e ite n b a n d v e r f a h r e n : I R -S p e k tr o s k o p ie m it M ik ro w e lle n g e n a u ig k e it Diese Arbeit ist Herrn Professor Helmut Dreizler am Institut für Physikalische Chemie der Univer­ sität Kiel aus Anlaß seines sechzigsten Geburtstags gewidmet. Herr Dreizler hat mir als einer der ersten die Idee vermittelt, die ursprünglich so unterschiedlichen Methoden der Mikrowellen und des Infraroten spektroskopisch als Einheit zu sehen. Dafür möchte ich ihm danken. W . A. Kreiner Infrared spectroscopy with laser sidebands at microwave modulation frequencies Infrared spectroscopy with laser sidebands at microwave modulation frequencies (12 18 GHz) is described. After the basics of this technique several examples of saturation spectroscopy on gaseous molecules are given. As a result it is shown that, in the infrared between 900 and 1100 cm" \ this broadband tunable laser source achieves resolution (3 parts in 109) as well as absolute accuracy in frequency measurement (± 3 x 10~6 cm-1) which are comparable to microwave spectroscopy. 
  Reference    Z. Naturforsch. 44a, 330—336 (1989); eingegangen am 6. Februar 1989 
  Published    1989 
  Keywords    Infrared beam modulator, laser spectroscopy, saturation dips Stark effect, double resonance 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0330.pdf 
 Identifier    ZNA-1989-44a-0330 
 Volume    44 
3Author    J. Seliger, V. ŽagarRequires cookie*
 Title    A New Nuclear-Quadrupole Double-Resonance Technique based on Solid Effect  
 Abstract    A new nuclear-quadrupole double-resonance technique is described. It has a higher sensitivity and a higher resolution than the conventional nuclear-quadrupole double-resonance technique based on solid effect. The new technique involves magnetic field cycling between a high and a low static magnetic field and simultaneous application of two //magnetic fields when the sample is in the low static magnetic field. A strong rf magnetic field induces "forbidden" simultaneous transitions in a magnetic (usually 1 H) and in a quadrupole spin system and thus couples the two spin systems. A weak//magnetic field induces transitions between the energy levels of the quadrupole nuclei and simulates a fast spin-lattice relaxation of the quadrupole nuclei when its frequency matches an NQR frequency. The sensitivity and resolution of the new technique are discussed and test measurements in tris-sarcosine calcium chloride are presented. 
  Reference    Z. Naturforsch. 52a, 337—342 (1997); received October 9 1996 
  Published    1997 
  Keywords    NQR, NMR, Double Resonance, Magnetic Field Cycling, Solid Effect 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0337.pdf 
 Identifier    ZNA-1997-52a-0337 
 Volume    52 
4Author    David Stephenson, JohnA S Smith, St Augustine, Tobago TrinidadRequires cookie*
 Title    Low Frequency NQR using Double Contact Cross-relaxation  
 Abstract    A cross-relaxation technique is described which involves two spin contacts per double reso-nance cycle. The result is an improvement in signal to noise ratio particularly at low frequencies. Experimental spectra and analyses are presented: 14 N in ammonium sulphate showing that the tech-nique gives essentially the same information as previous studies; 14 N in ammonium dichromate determining e 2 Qq/h as (76±3) kHz and r} = 0.84±.04; 7 Li in lithium acetylacetonate for which the spectrum (corrected for Zeeman distortion) yields e~Qq/h = (152 ±5) kHz and r\ -.5 ±.2. Calculated spectra are presented to demonstrate the r\ dependence of the line shapes for 7 Li. 
  Reference    Z. Naturforsch. 55a, 37—10 (2000); received September 11 1999 
  Published    2000 
  Keywords    NQR, l4 N, 7 Li, Low Frequency, Double Resonance 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0037.pdf 
 Identifier    ZNA-2000-55a-0037 
 Volume    55 
5Author    Gerhard Hägele, Detlef Wendisch, ++, Reiner Luckenbach, Hans-H BechtolsheimerRequires cookie*
 Title    Kernresonanzspektroskopische Untersuchungen an t-Butyl-phenyl-phosphinsäure-(—)-menthylester, II [1] 1 H-, 13 C-und 31 P-NMR-Analyse der absoluten Konfiguration am Phosphoratom NMR Spectroscopic Investigations on £-Butyl-phenyl-phosphinic Acid(—)-Menthyl Ester, II [1] 1 H, 13 C and 31 P NMR Analysis of Absolute Configuration at the Phosphorus Center  
  Reference    Z. Naturforsch. 35b, 1182—1190 (1980); eingegangen am 19. Mai 1980 
  Published    1980 
  Keywords    (—)-Menthol, Diastereomeric Menthylesters of Phosphinic Acids, 31 P NMR Spectra, 13 C NMR Spectra, Double Resonance 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1182.pdf 
 Identifier    ZNB-1980-35b-1182 
 Volume    35