ESR of the Triplet States of Randomly Oriented Molecules

Abstract

The observation of the Δm = 1 transitions of the triplet states of randomly oriented molecules by electron spin resonance (ESR) is discussed. The shape of the absorption curve permits the ready determination of the zero-field parameters from the spectrum. In a derivative presentation, the widths of the lines observed give direct information on environmental and hyperfine broadening. Computer simulations of triplet spectra are presented. Good agreement is found with the observed spectra of phosphorescent and ground-state triplets.

Characterization of a delocalized mixed-valence bis-macrocyclic diiron compound

“…The ESR spectrum for interacting magnetic dipoles should show a non-allowed transition at 8m = 2, the so-called half-field transition. 14 The intensity of this run = 2 transition is expected to be less than 2% of the allowed transition. We examined this energy region in our spectrum but the results were ambiguous due to a relatively large residual cavity signal at this exact field energy.…”

Strongly correlated one-dimensional magnetic behavior ofNiTa2O6

“…In the microwave absorption derivative the four outmost satellites have a positive amplitude while the two inner satellites have the shape of standard derivatives of EPR resonance lines with a positive and negative amplitude, indicating a peak in the direct EPR powder spectrum while the former outer satellites result from sharp edges in the EPR powder spectrum. [50] The four outmost satellites have a distance of |D| and |D + 3E|/2 with respect to the center, while the two inner satellites are by |D -E|/3 displaced from the center resonance field. [51] Applying this scenario to the EPR spectra of Ni 2+ in MgTa 2 O 6 we can identify the two satellites (A' and B') at the low field side of the g = 2.21 resonance line with the two innermost satellites of a random S = 1 triplet.…”

Electron paramagnetic resonance studies on copper(II) benzoate

“…This spectrum is typical of a triplet state in which D > hv, i.e. we observe resonances (designated using the notation of Wasserman et al (8)) Hz,, I-I,,, H,,, H,,; these are shown in Fig. 1.…”