title: Observation of the Stark effect in high-overtone band transitions of NH(3).
abstract: A sensitive dye-laser spectrometer is constructed to observe the Stark effect of weak-overtone transitions in NH(3). A DeltaP/P sensitivity of 10(-6) is achieved with the help of a laser-noise-reduction system. A relatively short (30-cm) and narrow-gap (0.25-mm) Stark electrode makes it possible to apply a high electric field on molecular gas at low pressure (~1 Torr). The Stark components of the upsilon = 5 overtone band transitions of NH(3) are well resolved. The rotational assignments are confirmed, and the dipole moment in the upsilon = 5 excited vibrational state is determined to be 1.40 +/- 0.02 D.
authors.forename: K
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Y
authors.initials: Y
authors.lastname: Moriwaki
authors.forename: T
authors.initials: T
authors.lastname: Shimizu