Coherent excitations of nuclei in crystals by synchrotron radiation pulses

✍ Scribed by J.P. Hannon; G.T. Trammell

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 608 KB
• Volume: 159
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(89)90034-3

✦ Synopsis

Synchrotron pulses will excite low lying nuclear levels, and in crystals they will create nuclear exciton states which are spatially coherent superpositions of the various excited state hyperfine levels of all the nuclei in the crystals. The subsequent radiative decay is radically affected by coherence, exhibiting both a speed-up due to "coherent enhancement", and a quantum beat modulation of the decay rate which gives a periodic speed-up/slow-down of the rate for photon decay into the coherent channels. For a nuclear exciton in an antiferromagnet, the quantum beat modulation will result in an interesting "temporal pendukkung" effect.