Quadrupole hyperfine structure of v=3←0, 6←0 overtone band spectral lines of HI observed with near infrared diode lasers

Abstract
Diode lasers in the near infrared region are used to observe overtone band transitions (v=3←0, and 6←0) of the HI molecule. From spectral line shape analysis of low J transitions, quadrupole coupling constants eqQ in the v=3, and 6 vibrational states are determined to be −1948±5 and −2066±5 MHz, respectively.