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The pressure broadening and shift for the J=1−0 line of CH3C14N: Resolved and overlapped hyperfine components

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Il Nuovo Cimento D

Summary

Pressure broadening and shift parameters are measured for the J=1−0 line of CH3C14N at 18.4 GHz, both for the three hyperfine components and for the single line which envelopes the hyperfine components, observed at higher pressures (p≥40 mTorr). In agreement with theoretical predictions, these parameters are the same for all the observed lines: Γ p =(50±5)MHz/Torr, s=(7±2) MHz/Torr. These values are compared with previous measurements, showing a large variance expecially for the shift parameter. The measured broadening parameter is 40% lower than prediction of the Anderson theory.

Riassunto

Sono stati misurati i parametri di allargamento e spostamento per pressione della riga J=1−0 del CH3C14N a 18.4 GHz. Tali misure sono state eseguite, sulle tre componenti iperfini e sul loro inviluppo osservato a pressioni p≥40 mTorr. In accordo con le previsioni teoriche, questi parametri risultano gli stessi per tutte le righe osservate: Γ p =(50±5)MHz/Torr, s=(7±2) MHz/Torr. Questi valori sono confrontati con quelli delle precedenti misure che mostrano una considerevole dispersione, specialmente per quanto riguarda il parametro di spostamento. L'allargamento per pressione è risultato piú basso di quello previsto dalla teoria di Anderson di circa il 40%.

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Buffa, G., Giulietti, D., Lucchesi, M. et al. The pressure broadening and shift for the J=1−0 line of CH3C14N: Resolved and overlapped hyperfine components. Il Nuovo Cimento D 7, 105–112 (1986). https://doi.org/10.1007/BF02452400

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