Abstract

The absorption spectrum of D2O vapor from 0.2 to 2.0THz (6.7–67cm−1) which is associated with rotational modes was measured at one atmosphere using terahertz time-domain spectroscopy (THz-TDS). The linewidth and collisional dephasing times were measured for 26 pure rotational transitions in the ground vibrational state (000). The temperature dependence of the linewidth (Δν) behaves as Δν∼T−3/4 and the linewidth decrease with increasing temperature is attributed to the 1/r6 force of interaction between colliding D2O molecules.

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