Quantum Beat Signals and Mössbauer Spectra with Recoil‐Free γ‐Rays Scattered by an Oscillating Quartz Crystal

Abstract

The elastic and inelastic scattering from piezoelectrically excited X-cut quartz crystals is investigatcd with y-diffractometry from the (1120) Bragg planes using a 57C0 Mossbauer source and a resonance absorber. The investigation is performed in the energy coordinate by means of Doppler motion of thc source and in the time domain by means of the quantum beat technique. Examples of y-Brillouin spectra from the energy analysis and quantum beat signals of the quartz vibrations with frequencies even below the radiation width are presented.Mossbauer Quanten einer 57Co-Quelle, die von einem piezoelektrisch angeregten X-Schnitt-Quarz an den (1 120) Netzebenen elastisch und inelastisch gestreut werden, werden mit einem y-Diffraktometer und einem Resonanzabsorber analysiert. Diese Analyse geschieht in der Energie durch Dopplerbewegung der Quelle und in der Zeitachse durch die Methode der Quantenschwebungen. Es werden Beispiele fur y-Brillouinspektren aus der Energieuntersuchung angegeben und Beispiele fur QuantenBeat-Signale bei Quarzschwingungen auch unterhalb der Linienbreite der Mossbauerstrahlung.

Quantum Beats of Recoil‐Free γ‐Radiation in the Direct and Bragg Diffracted Beam

“…In our investigations of piezoelectic excitations of quartz crystals the quantum beats of recoil-free electromagnetic radiation were observed in different experimental arrangements. The excitation energy was comparable with the inhomogeneous width T s of the Mossbauer source; it may also be less than T s [9]. We are now able to propose a consistent explanation of the important result that y-quantum beat signals were observable in the experimental set-up of Fig.…”

“…The experimental set-up of the present investigation is described in detail in our paper [9]. Briefly summarized it is a two-axis y-ray diffractometer combined with a standard Mossbauer equipment and a quantum beat device for time-correlated y-detection incorporated on the same instrument.…”

“…coherent decay channel of a single crystal. Finally Kuhn and Jex [9] first observed quantum beats of the s7C0 Mossbauer radiation in a diffraction experiment from an excited quartz crystalas a non-resonant scattererthat was mounted under the Bragg angle of the (1 120) reflection between the source and the absorber, both at rest.…”

Quantum Beats in Time Resolved X-Ray Interference Experiments

“…The first experiment by Kuhn and Jex [14] was performed with a Mo È ssbauer source±absorber combination to analyse the quantum beating in time resolved Bragg scattering from oscillating quartz and the second contribution stems from the application of nuclear exciton decay radiation of two resonance absorbers in a synchrotron radiation beam with Bragg scattering from an excited quartz between the two foils. In the presence of sound waves the scattering planes are shifted by a vector u and the effective dielectric susceptibility reads c H (r) = c(r ± u).…”

Mössbauer Spectra and Quantum Beats of γ‐Rays Backscattered from a Resonance Absorber on an Oscillating Quartz

“…The experimental set-up of the present investigation was described in detail in our previous paper [8]. Briefly summarized it is a two-axis diffractometer combined with a standard equipment for Miissbauer spectroscopy and a quantum beat device for time correlated photon detection incorporated on the same instrument.…”