He I ultraviolet photoelectron spectroscopy of benzene and pyridine in supersonic molecular beams using photoelectron imaging. Liu, S., Alnama, K., Matsumoto, J., Nishizawa, K., Kohguchi, H., Lee, Y., & Suzuki, T. The Journal of Physical Chemistry A, 115(14):2953–65, April, 2011.
He I ultraviolet photoelectron spectroscopy of benzene and pyridine in supersonic molecular beams using photoelectron imaging. [link]Paper  doi  abstract   bibtex   
We performed He I ultraviolet photoelectron spectroscopy (UPS) of jet-cooled aromatic molecules using a newly developed photoelectron imaging (PEI) spectrometer. The PEI spectrometer can measure photoelectron spectra and photoelectron angular distributions at a considerably higher efficiency than a conventional spectrometer that uses a hemispherical energy analyzer. One technical problem with PEI is its relatively high susceptibility to background electrons generated by scattered He I radiation. To reduce this problem, we designed a new electrostatic lens that intercepts background photoelectrons emitted from the repeller plate toward the imaging detector. An energy resolution (ΔE/E) of 0.735% at E = 5.461 eV is demonstrated with He I radiation. The energy resolution is limited by the size of the ionization region. Trajectory calculations indicate that the system is capable of achieving an energy resolution of 0.04% with a laser if the imaging resolution is not limited. Experimental results are presented for jet-cooled benzene and pyridine, and they are compared with results in the literature.
@article{Liu2011,
	title = {He {I} ultraviolet photoelectron spectroscopy of benzene and pyridine in supersonic molecular beams using photoelectron imaging.},
	volume = {115},
	issn = {1520-5215},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/21413769},
	doi = {10.1021/jp1098574},
	abstract = {We performed He I ultraviolet photoelectron spectroscopy (UPS) of jet-cooled aromatic molecules using a newly developed photoelectron imaging (PEI) spectrometer. The PEI spectrometer can measure photoelectron spectra and photoelectron angular distributions at a considerably higher efficiency than a conventional spectrometer that uses a hemispherical energy analyzer. One technical problem with PEI is its relatively high susceptibility to background electrons generated by scattered He I radiation. To reduce this problem, we designed a new electrostatic lens that intercepts background photoelectrons emitted from the repeller plate toward the imaging detector. An energy resolution (ΔE/E) of 0.735\% at E = 5.461 eV is demonstrated with He I radiation. The energy resolution is limited by the size of the ionization region. Trajectory calculations indicate that the system is capable of achieving an energy resolution of 0.04\% with a laser if the imaging resolution is not limited. Experimental results are presented for jet-cooled benzene and pyridine, and they are compared with results in the literature.},
	number = {14},
	urldate = {2012-11-10},
	journal = {The Journal of Physical Chemistry A},
	author = {Liu, Suet-Yi and Alnama, Koutayba and Matsumoto, Jun and Nishizawa, Kiyoshi and Kohguchi, Hiroshi and Lee, Yuan-Pern and Suzuki, Toshinori},
	month = apr,
	year = {2011},
	pmid = {21413769},
	keywords = {\#nosource, Benzene, Benzene: chemistry, Free Radicals, Free Radicals: chemistry, Photoelectron Spectroscopy, Photoelectron Spectroscopy: instrumentation, Pyridines, Pyridines: chemistry, Spectrophotometry, Ultraviolet, Spectrophotometry, Ultraviolet: instrumentation, Ultraviolet, Ultraviolet: instrumentation},
	pages = {2953--65},
}

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