High-resolution sub-Doppler Lamb dips of the ν2 fundamental band of H3(+).
The high-resolution sub-Doppler Lamb dips of the ν2 fundamental band transitions of H3(+) have been observed using an extended negative glow discharge tube as an ion source and a periodically poled lithium niobate optical parametric oscillator as a radiation source. The absolute frequency of the R(1,0) transition was measured to be 81,720,371.550 MHz with an accuracy of 250 kHz using an optical frequency comb. In addition, we have investigated the linewidth of the Lamb-dip signal of the R(3,0) transition systematically and obtained its pressure-broadening parameter, which may shed some light on the reaction of H3(+) with H2. This is the first observation of the infrared saturated spectrum and the first determination of the pressure-broadening parameter of the ro-vibrational transitions of a molecular ion.
Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan.
Hsuan-Chen
HC
Chen
Chung-Yun
CY
Hsiao
Jin-Long
JL
Peng
Takayoshi
T
Amano
Jow-Tsong
JT
Shy