Coherent aspects of the local dipolar field in echo dynamics: A spectral narrowing effect

被引:4
作者
Boscaino, R [1 ]
Gelardi, FM [1 ]
Cannas, M [1 ]
机构
[1] CNR,INST INTERDISCIPLINARY APPLICAT PHYS,PALERMO,ITALY
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 01期
关键词
D O I
10.1103/PhysRevB.53.302
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have measured the spectral content of the echo radiation emitted by a two-level spin system ([AlO4](0) centers in quartz), after a two-pulse excitation sequence, theta(1)-tau-theta(2). In general, the experimental spectral shapes reproduce qualitatively those calculated for an inhomogeneous system of noninteracting spins. However, we found that in certain ranges of the sequence parameters (theta(1), theta(2) and tau) the widths of the experimental spectra are less than expected by a factor that amounts up to 0.5. The observed narrowing effect involves the spin packets located in a narrow spectral bandwidth (of the order of the Rabi frequency) around the excitation frequency and occurs whenever the excitation sequence induces a transverse oscillating moment of the strictly resonant packets. The spectral narrowing is a-transient effect, in the sense that the spectral widths tend to recover their theoretical values for long interpulse distances tau. We suggest a tentative interpretation which relates the narrowing to the coherence properties of the local field generated by precessional motion of the echo-active spins.
引用
收藏
页码:302 / 306
页数:5
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