Ammonia spectrum as a test for two different pressure shift theories.
Pressure shift calculations, based on the semiclassical ATC theory and on the quantum Fourier transform (QFT) theory, are compared wtih experimental results for seventy-two inversion, rotation, and vibration transitions of (14)NH(3) and (15)NH(3). ATC, even if not exact, allows a far better agreement than QFT. A possible reason for this is briefly discussed.
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Tarrini
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