Evaluation of low-temperature electron paramagnetic resonance in analytical chemistry

✍ Scribed by E. Moyer; G. Guilbault

• Book ID: 104103716
• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 515 KB
• Volume: 52
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(01)80958-2

✦ Synopsis

Tl1c.z investigation of low-temperature glasses in electron paramugnetic resonance (e.p.r.) has been limited to studies of physical parameters. Variation of line width with tempernturc~~~, evaluation of perpenclicular and parallel g-fnctors:'~~~, and effects of telIlpWiltUre on hyperfinc structure:!-:, have been investigated. However, the use of reduced teruperatures for improvement of analytical results has uot been reported. Tlleoretical factors predict enhanced signal intensities at reduced tempcrahires. 1.3~ lowering the temperature of the cavity, the Q-factor is considerably increased producing a more efficient system. Also, the relaxation time can be optimized by decreasing tile temperature of the sample. Different temperatures for each system procluce a maximum signal due to a combination of the above two factors. Therefore, in order to improve the lower limits of detection, anaLytica curves were run at the optimum temperature of the systems. Tllese results, plus instrumental parameter effects, arc discussed in this paper. AND G. J. ~~~13llAN0. n?d. h?~tf?rS, I (1968) 725. 7 G. G. GUILUAULT AND E. S. MoYI%R, ilad. Chn~., 42 (rg70) 441. 8 E. S. MOYER AND W. J. MCC,\RTHY, .4wl.