Abstract
Ultrasonic techniques for very high frequency phonons are discussed. The superconducting tunnel junction makes possible experiments with monochromatic phonons in the region 1011 Hz to 1012 Hz (section 3). By the “heat pulse” technique phonon radiation with Planck frequency distributions can be generated up to 1013 Hz (section 2). In special cases monochromatic phonon detection at 1012 Hz and higher frequencies is possible with an optical technique (section 4). Other methods are discussed in section 5. Phonons up to 1012 Hz (wavelengths 100 Å) in dielectric crystals at helium temperatures are found to have very long lifetimes (>10−6 sec).
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