Department of Chemistry, Willamette University, Salem, Oregon 97301, USA.
Appl Spectrosc. 2010 Dec;64(12):1419-22. doi: 10.1366/000370210793561637.
Gas-phase molecular iodine laser-induced fluorescence (LIF) spectra were recorded out to 815 nm at 1 cm(-1) resolution using green, yellow, and red helium-neon (HeNe) lasers as excitation sources. Nine previously unreported I(2) B←X absorption transitions accessed by these lasers were identified, and specific rovibronic transition assignments were made for two hundred LIF peaks--more than sixty per laser. These I(2) LIF peaks can be used to calibrate the vacuum wavenumber coordinate of spectrometers to better than 0.1 cm(-1) accuracy. In particular, green HeNe excitation of the I(2) R(106) 28-0 transition leads to strong fluorescence well suited for calibration, with a rotational doublet spacing of 15 cm(-1) and a doublet-to-doublet spacing of 190 cm(-1). Calibration by HeNe I(2) LIF may be an especially valuable technique for Raman spectroscopy applications.
采用氦氖（HeNe）绿、黄、红光激光器作为激发光源，在 1cm(-1)分辨率下记录到 815nm 的气相分子碘激光诱导荧光（LIF）光谱。鉴定出了 9 种先前未报道的通过这些激光器进入的 I(2) B←X 吸收跃迁，并对 200 个 LIF 峰进行了特定的 rovibronic 跃迁分配——每个激光器超过 60 个。这些 I(2) LIF 峰可用于将光谱仪的真空波数坐标校准到优于 0.1cm(-1)的精度。特别是，I(2) R(106) 28-0 跃迁的绿 HeNe 激发导致非常适合校准的强荧光，其旋转双峰间距为 15cm(-1)，双峰间距为 190cm(-1)。HeNe I(2) LIF 的校准可能是拉曼光谱应用的一种特别有价值的技术。
