Abstract
Thin-film PbTe diode lasers are used for Doppler-limited Stark spectroscopy on the vibration-rotation ν4 band of 1545–1595-cm−1 region. The lasers operate cw below 20 K and are frequency tuned by varying the diode current. The ν4 excited state dipole moment of NH3 is found to be about 1% less than the ground state value.
© 1974 Optical Society of America
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