Photoexcitation of CH3NCO,CH3NCS and CH3SCN in the vacuum ultraviolet: Rydberg states and photofragment emission |
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| Institution: | 1. Servicio de Neurocirugía, Hospital Universitario de la Ribera, Alzira, Valencia, España;2. Unidad Docente Multidisciplinar de Atención Familiar y Comunitaria, Castellón, España;3. Servicio de Otorrinolaringología, Hospital Universitario de la Ribera, Alzira, Valencia, España;4. Servicio de Medicina Interna, Hospital Universitario de la Ribera, Alzira, Valencia, España;5. Servicio de Endocrinología, Hospital Universitario de la Ribera, Alzira, Valencia, España;6. Facultad de Medicina, Universidad Católica de Valencia «San Vicente Mártir», Valencia, España;7. Cátedra de Neurociencias, CEU Universidad Cardenal Herrera / Fundación Vithas-NISA Valencia, Valencia, España;1. Copenhagen Center for Atmospheric Research, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark;2. Department of Chemistry and Biochemistry, California State University Northridge, Northridge, CA 91330-8262, USA;1. Genomic Integrity and Structural Biology Laboratory, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA;2. Signal Transduction Laboratory, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA;1. Division of Biotechnology, Advanced Institute of Environmental and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Republic of Korea;2. Pohang Accelerator Laboratory (PAL), Pohang University of Science and Technology POSTECH), Pohang 790-784, Republic of Korea |
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| Abstract: | Photoabsorption cross sections and fluorescence excitation spectra of CH3NCO, CH3NCS and CH3SCN vapor were measured in the vacuum ultraviolet using synchrotron radiation. Many sharp structures observed from CH3NCO and CH3SCN in the 120–180 nm region are classified into three Rydberg series and their vibrational progressions, whereas for CH3NCS six broad bands exhibit no fine structure. The emission which starts to appear at 172.8 ± 1.0 nm excitation of CH3NCO is attributed to the NCO(A2Σ+-X2Π) band. The emissions from CH3NCS and CH3SCN are assigned to the A2Π-X2Π and B2Σ+-X2Π bands of NCS; the CN(B2Σ+-X2Σ+) band is also observed at 125 nm excitation of CH3SCN. The photodissociation processes are discussed in accord with the emission observed. |
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