Some remarks on reported inconsistencies in the high-field EPR spectrum of DPPH

被引：13

作者：

Kolaczkowski, SV ^{[1
]}

Cardin, JT ^{[1
]}

Budil, DE ^{[1
]}

机构：

[1] Northeastern Univ, Dept Chem, Boston, MA 02115 USA

来源：

APPLIED MAGNETIC RESONANCE | 1999年 / 16卷 / 02期

关键词：

D O I：

10.1007/BF03161939

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Previous conflicting reports concerning the EPR lineshape of commercially obtained 2,2'-diphenyl-1-picrylhydrazyl (DPPH) at frequencies above 200 GHz are investigated. The magnetic parameters of dilute DPPH in polystyrene film determined at 220 GHz are presented. It is demonstrated that commercially obtained crystalline samples of DPPH which produce a broad line at 220 GHz when used without purification do produce a narrow line at 220 GHz when recrystallized from carbon disulfide. This observation suggests that the reported discrepancies in the high-field EPR spectrum of DPPH may be reconciled without invoking chemical impurities or misidentification. It also suggests a standard preparation procedure for DPPH that should be employed if DPPH is to be used as a marker for high-field EPR.

引用

页码：293 / 298

页数：6

共 13 条

[1]

ALTSHULER SA, 1964, ELECT PARAMAGNETIC R, P298

[2]

BUDIL DE, 1989, ADV EPR APPL BIOL BI, P307

[3] Quasioptical design for an EPR spectrometer based on a horizontal-bore superconducting solenoid [J].