Spectroscopy With Stark And Zeeman Effect Study Of Several Radicals By Laser-induced Fluorescemce

The main contributions presented in this dissertation are a newly built Laser-induced fluorescence (LIF) apparatus, the study on the low resoulution spectra of NiC1、NiS and NiO, and high resoulution spectra with their Stark and Zeeman effects of PtF、BaS、TiH/TiD,by using LIF combined with the techniques of gas discharge and laser ablation in supersonic molecular beam.1.Study on the low resolution spectroscopics of nickel containing radicalsThe NiC1、NiS and NiO radicals were produced in a supersonic jet by DC pin discharge of a mixture of CH2C12、H2S、O2in Ar. The LIF spectra of NiCl in12500-15000cm-1region were recorded and attributated to the [13.0]2Π3/2(ν=0-5)-X2Π3/2(ν"=0) transitions, the rotational constants, isotopic shifts and lifetimes were determined by rotational analysis.The LIF spectra of NiS in the region of720-820nm were recorded and rotationally analyzed, four vibronic bands were assigned to [12.4]3Σ0-(ν’=0-3)-X3Σ0-(ν"=0) transitions.55bands were rotationally analyzed for NiO in510-650nm, only26vibronic bands were grouped into five transition progressions due to their highly irregular isotopic shifts and vibrational intervals. Furthermore, dispersed fluorescence and lifetimes of the strong bands have also been measured.2. Study on the high resolution spectrum and its Stark effect of PtFThe[11.9]Ω=3/2←X2Π3/2bands of PtF have been recorded field-free and in the present of a static electric field. The high precision rotational constants for the excited state and magnetic hyperfine interactions for19F and195Pt have been analyzed.The optical Stark shifts were analyzed to produced the permanent electric dipole moments, μel of2.47(11) D and3.42(6) D for[11.9] Ω=3/2and X2Π3/2states, respectively. The observed trend in μel for the PtX (X=C, N, O, S, and F) series and IrF are discussed. 3. Study on the Stark spectrum of BaSThe R(0) and R(1)lines of theA1Σ+(ν=3)-X1Σ+(ν=0) band of the138Ba32S were recorded at high resolution(full width at half maximun, FWHM≌35MHz) and at a field strength of up to3100V/cm. The observed Stark shifts were analyzed to produce permanent electric dipole moments, μel of10.765(8) D and5.586(22) D for the X1Σ+(ν=0) and A1Σ+(ν=3)states, respectively. The relative values of μel for BaO and BaS are discussed.4. Study on the Zeeman spectra of TiH/TiDThe Zeeman effect in the(0,0) bands of B4Γ5/2-X4φ3/2system of TiH/TiD has been recorded and analyzed. Magnetic tuning of the spectral features recorded at high resolution (FWHM≌35MHz) and at a field strength of4.5kG is accurately modeled using an effective Zeeman Hamiltonian. The determined magnetic g factors for the X4φ3/2(v=0) state deviate only slightly from the expected, while the g factors for the B4Γ5/2(v=0) states deviate significantly from those of an isolated B4Γs/2state.The rotational dependence of the magnetic tuning in the state B4Γ5/2(ν=0) is attribuated to perturbation from a nearby4φ3/2state.