研究目的
Investigating the B?-X? laser-induced fluorescence and dispersed fluorescence spectra of jet-cooled isopentoxy radicals to understand their molecular structure and properties.
研究成果
The study successfully observed B?-X? LIF and DF spectra of jet-cooled isopentoxy radicals, identifying three lowest-energy conformers as spectral carriers. The absence of strong transitions to the CO-stretch levels is attributed to low-barriers for β C-C fission or predissociation in the B? state. DF spectra of the GG and TG conformers are dominated by strong vibrational progressions of the CO-stretch mode or its combination with other vibrational modes due to Duschinsky mixing. The ?-X? separations of the GG and TG conformers have been determined to be 409 and 263 cm?1, respectively.
研究不足
The absence of strong transitions to the CO-stretch levels in the LIF spectrum is attributed to low-barriers for β C-C fission or predissociation in the B? state. The broadening of the DF transitions may be attributed to both the complicated vibronic structure and the low isomerization barriers between conformers.
1：Experimental Design and Method Selection:
The experiment utilized a LIF/DF apparatus to obtain vibrationally resolved electronic spectra of the isopentoxy radical. Isopentoxy radicals were generated by laser photolysis of isopentyl nitrite in a supersonic jet expansion.
2：Sample Selection and Data Sources:
The precursor, isopentyl nitrite, was stored in a stainless-steel reservoir and its vapor was entrained into the jet expansion by high-pressure helium flow.
3：List of Experimental Equipment and Materials:
A solenoid pulsed nozzle, a Nd:YAG laser for photolysis, a frequency-doubled pulsed dye laser for excitation, a photomultiplier tube for LIF signal detection, and a monochromator with an intensified charge-coupled device for DF spectra.
4：Experimental Procedures and Operational Workflow:
The free jet expansion was intercepted by a photolysis laser beam, and photolysis-generated ground-state radicals were excited to the B? electronic state. LIF signal was collected and detected, while DF spectra were recorded by pumping different vibronic bands.
5：Data Analysis Methods:
The wavelength of the dye laser was calibrated using opto-galvanic transitions of a helium hollow cathode lamp. DF spectra were analyzed for vibrational progressions and conformational identification.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
