✦ LIBER ✦

Relaxation-induced oscillations of spin-echo envelopes

✍ Scribed by Thomas Meersmann; Geoffrey Bodenhausen

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 602 KB
Volume: 257
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00560-x

No coin nor oath required. For personal study only.

✦ Synopsis

In scalar-coupled spin systems where in-phase and antiphase coherences have different lifetimes, the envelopes of spin echoes may feature modulations that are induced by relaxation. These modulations are most pronounced when the couplings that lead to the interconversion of in-phase and antiphase coherences are too small to provide an effective mechanism for averaging. The modulations occur even if the scalar coupling term is formally eliminated from the average Hamiltonian that describes the evolution between initial excitation and the time of the echo. The frequency of the relaxation-induced oscillations is one-half of the scalar coupling constant, and the modulation depth is determined by the ratio between the difference in relaxation rates of the in-phase and antiphase coherences and the scalar coupling.

📜 SIMILAR VOLUMES

Observation of spin-locked electron spin

Observation of spin-locked electron spin echo envelope modulation

✍ Y.C. Zhong; J.R. Pilbrow 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 467 KB

Electron spin echo envelope modulation (ESEEM) is observed in a coal sample utilizing a two-pulse sequence originally proposed by Hartmann and Hahn to generate a 'spin-locked echo'. It is experimentally shown that this spin-locked ESEEM (SLESEEM) is similar to three-pulse ESEEM rather than conventio

Basics and features of spin-locked elect

Basics and features of spin-locked electron spin echo envelope modulation

✍ Gunnar Jeschke; Arthur Schweiger 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 441 KB

It is demonstrated that the spin-locked electron spin echo envelope modulation (ESEEM) experiment recently introduced by Zhong and Pilbrow [Chem. Phys. Letters 222 (1994) 5921 does not yield the same information as the conventional three-pulse ESEEM experiment because of the hyperfine decoupling inh

Measurement of Spin-Lattice Relaxation T

Measurement of Spin-Lattice Relaxation Times in Double Spin-Echo Imaging

✍ Max S. Lin 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 489 KB 👁 1 views

Calculation of tissue TI in double spin-echo imaging (90"-T-I 80"-2T-1 SO0) using two repetition times (6, and b2) has entailed an approximation that ignores the two 180" pulses. The theoretical consequence of the simplification is to overestimate TI with a fractional error that increases with incre

Powder pattern behavior of the electron

Powder pattern behavior of the electron spin echo envelope modulation effect

✍ Sook Lee 📂 Article 📅 1978 🏛 Elsevier Science ⚖ 241 KB

Analysis of signal intensities in electr

Analysis of signal intensities in electron spin echo envelope modulation spectroscopy

✍ H. Barkhuijsen; R. De Beer; D. Van Ormondt 📂 Article 📅 1983 🏛 Elsevier Science 🌐 English ⚖ 411 KB

Unlike LNDOR, electron spin echo envelope modulation (ESEEM) spectroscopy enables one to interpret the signal intensity without knowledge of relaxation processes. The technique is put to the test through analysis of the signal from 3gK in the fifth shell around the F-centre in a single crystal of KC

Refocused Primary Echo: A Zero Dead Time

Refocused Primary Echo: A Zero Dead Time Detection of the Electron Spin Echo Envelope Modulation

✍ A.V Astashkin; A.M Raitsimring 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 310 KB

We report on the two-dimensional (2D) implementation of the refocused primary electron spin echo envelope modulation (ESEEM) technique, its theory and experimental application to a model system and a system of biological interest. This technique is virtually free of dead time along one time coordina