Laser Spectroscopy of Iridium Monoboride

Abstract

High resolution laser induced fluorescence spectrum of IrB in the spectral region between 545 to 610 nm has been recorded and analyzed. Reacting laser-ablated iridium atoms with 1% B H seeded in argon produced the IrB molecule. Four vibronic transition bands: (v, 0) with v = 0-3 of an electronic transition system have been observed. Spectra of all four isotopic molecules: Ir B, Ir B, Ir B and Ir B were recorded. Relationship between isotopic molecules confirmed the vibrational quantum number assignment. Preliminary analysis of the rotational lines showed that these vibronic bands are with # = 2 and # = 3. Partially resolved hyperfine structure conformed to case a coupling scheme has been observed.