Four electronic states of NiBr have been studied using the technique of laser vaporization/reaction with supersonic cooling and laser induced fluorescence ͑LIF͒ spectroscopy. NiBr molecules were produced by reacting laser ablated nickel atoms and ethyl bromide (C 2 H 5 Br). High resolution LIF spectrum between 724 and 810 nm was recorded, which consists of the ͑2,0͒, ͑1,0͒, and ͑0,0͒ bands of the ͓13.2͔ 2 ⌸ 3/2-X 2 ⌸ 3/2 system and the ͓13.2͔ 2 ⌸ 3/2-A 2 ⌬ 5/2 system, and also the (v,0) with vϭ0-4 bands of the ͓12.6͔ 2 ⌺ ϩ-X 2 ⌸ 3/2 system. Spectra of four isotopic molecules: 58 Ni 79 Br, 58 Ni 81 Br, 60 Ni 79 Br, and 60 Ni 81 Br were observed and analyzed. Least squares fit of rotationally resolved transition lines yielded accurate molecular constants for the X 2 ⌸ 3/2 , A 2 ⌬ 5/2 , ͓12.6͔ 2 ⌺ ϩ , and ͓13.2͔ 2 ⌸ 3/2 electronic states of NiBr. The bond length, r 0 , measured for the X 2 ⌸ 3/2 and A 2 ⌬ 5/2 states is 2.196 28 and 2.164 45 Å, respectively. A molecular orbital diagram has been constructed to explain the four observed electronic states. This work represents the first high-resolution spectroscopic study of NiBr.
High resolution laser induced fluorescence spectrum of IrB in the spectral region between 545 and 610 nm has been recorded and analyzed. Reacting laser-ablated iridium atoms with 1% B(2)H(6) seeded in argon produced the IrB molecule. This is the first experimental observation of 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, (191)Ir(10)B, (193)Ir(10)B, (191)Ir(11)B, and (193)Ir(11)B, were recorded. Isotopic relationships confirmed the carrier of the spectra and the vibrational quantum number assignment. Preliminary analysis of rotational lines showed that these vibronic bands are with Omega' = 2 and Omega" = 3. The electronic transition identified is assigned as the [16.5](3)Pi(2)-X(3)Delta(3) system. Partially resolved hyperfine structure which conforms to the Hund's case a(beta) coupling scheme has been observed and analyzed. The bond length r(0) of the lower X(3)Delta(3) state of IrB was determined to be 1.7675 A.
High-resolution laser-induced fluorescence spectrum of a jet-cooled NiI molecule has been recorded in the near infrared and visible regions. The NiI molecule was produced by reacting laser-ablated nickel atom and methyl iodide (CH 3 I). Three electronic states have been identified that include the X 2 ⌬ 5/2 and two low-lying ͓13.9͔ 2 ⌸ 3/2 and ͓14.6͔ 2 ⌬ 5/2 excited states. Molecular transition bands (vЈ,0) of the ͓13.9͔ 2 ⌸ 3/2 ϪX 2 ⌬ 5/2 system with vЈϭ0, 4-9, and the (vЈ,0) bands of the ͓14.6͔ 2 ⌬ 5/2 ϪX 2 ⌬ 5/2 system with vЈϭ0-6 were observed and analyzed. Spectra of isotopic molecules confirmed the assignment of vibrational quantum number of the observed bands. Least squares fit of rotational transition lines yielded accurate molecular constants for the states studied. The bond length r 0 measured for the X 2 ⌬ 5/2 is 2.3479 Å and the equilibrium bond length, r e , for the ͓13.9͔ 2 ⌸ 3/2 and ͓14.6͔ 2 ⌬ 5/2 are, respectively, 2.4834 and 2.5081 Å. With the use of a molecular orbital energy level diagram, we have examined the electronic configurations that give rise to the X 2 ⌸ 3/2 ground state for NiF, NiCl, and NiBr, but the X 2 ⌬ 5/2 state for NiI. This work represents the first spectroscopic study of the NiI molecule.
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