Performance of an elliptically polarized undulator beamline

Chung, S. C.; Chen, J.; Huang, Liang; Wu, Rigeng; Chen, C.-C.; Nianan, Cheng; Chuang, Jiun-Kai; Tseng, P. C.; Huang, Di‐Jing; Chang, C. F.; Perng, Shen-Yaw; Chen, C.T.; Tsang, K. L.

doi:10.1016/s0168-9002(01)00354-0

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…The high-voltage pulse produced a large interference of the ion-detection system in the region of small mass (m/z ≤ 2 u); the mass spectra were recorded for only m/z > 2 u. X-rays were provided from Taiwan Light Source, undulator beamline BL05B1. 25 The resolutions of X-rays were about 80, 70, and 150 meV at the carbon, nitrogen, and oxygen K-edges, respectively. The resolutions for the isotopic experiments were about 160, 140, and 300 meV at the carbon, nitrogen, and oxygen K-edges, respectively.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The experiments were performed with a homemade, orthogonal-acceleration, reflectron, time-of-flight, mass spectrometer (OA-R-TOF MS). 24 A diffusive molecular beam was generated from an orifice of a sample cell (stainless steel) near 300 K. Soft X-rays from a synchrotron 25 were directed into the ionization chamber with two bendable refocusing Kirkpatrick− Baez mirrors coated with Au. The X-rays crossed the diffusive molecular beam about 2 mm downstream from the orifice of the sample cell.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…X-rays were provided from Taiwan Light Source, undulator beamline BL05B1 . The resolutions of X-rays were about 80, 70, and 150 meV at the carbon, nitrogen, and oxygen K-edges, respectively.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Highly Selective Dissociation of a Peptide Bond Following Excitation of Core Electrons

et al. 2015

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The controlled breaking of a specific chemical bond with photons in complex molecules remains a major challenge in chemistry. In principle, using the K-edge absorption of a particular atomic element, one might excite selectively a specific atomic entity in a molecule. We report here highly selective dissociation of the peptide bonds in N-methylformamide and N-methylacetamide on tuning the X-ray wavelength to the K-edge absorption of the atoms connected to (or near) the peptide bond. The high selectivity (56-71%) of this cleavage arises from the large energy shift of X-ray absorption, a large overlap of the 1s orbital and the valence π* orbital that is highly localized on a peptide bond with antibonding character, and the relatively low bond energy of the peptide bonds. These characteristics indicate that the high selectivity on bond dissociation following core excitation could be a general feature for molecules containing peptide bonds.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Highly Selective Dissociation of a Peptide Bond Following Excitation of Core Electrons

et al. 2015

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“…As details of the synchrotron radiation beamline have been reported, 48 only a brief description is provided here. This beamline delivers >10 12 photons/s with energy in the 60−1400 eV range.…”

Section: ■ Experimentsmentioning

confidence: 99%

Near-Edge X-ray Absorption Fine Structure Spectra and Site-Selective Dissociation of Phenol

Lin

Lee

et al. 2014

J. Phys. Chem. A

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A time-of-flight mass spectrometer with orthogonal acceleration and soft X-rays from synchrotron radiation were utilized to measure near-edge X-ray absorption fine structure (NEXAFS) spectra of carbon and oxygen in phenol and the corresponding ionic fragments following core excitation. The photon energies were in the range of 284-298 eV for the carbon K-edge and 529.5-554.5 eV for the oxygen K-edge. The total ion yield, ion intensity for each ionic fragment, and ion intensity ratio, defined as ion intensity divided by total ion yield, were measured as a function of photon energy. Possible mechanisms of dissociation are proposed and enhancements of specific products of dissociation are reported. In general, the enhancement of these specific products is small in the carbon K-edge region but is clear for some products at the oxygen K-edge. In particular, elimination of the H atom from the hydroxyl group was observed only at the oxygen K-edge. One remarkable result is that an excitation of a core-level electron of oxygen greatly enhanced the cleavage of specific C-C bonds.

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“…These experiments were performed at undulator beamline BL05B1 at the Taiwan Light Source, details of which have been reported previously; 23 only a brief description is presented here. This beamline delivers >10 12 photons s −1 with energies of 60− 1400 eV.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Core Excitation, Specific Dissociation, and the Effect of the Size of Aromatic Molecules Connected to Oxygen: Phenyl Ether and 1,3-Diphenoxybenzene

Lin

Lee

et al. 2014

J. Phys. Chem. A

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Near-edge X-ray absorption fine structure (NEXAFS) spectra of phenyl ether at the carbon K-edge and 1,3-diphenoxybenzene at both the carbon and oxygen K-edges were measured in the total ion yield mode using X-rays from a synchrotron and a reflectron time-of-flight mass spectrometer. Time-dependent density functional theory was adopted to calculate the carbon and oxygen K-edge NEXAFS spectra of phenol, phenyl ether, and 1,3-diphenoxybenzene. The assignments and a comparison of the experimental and calculated spectra are presented. The mass spectra of ionic products formed after X-ray absorption at various excitation energies are also reported. Specific dissociations were observed for the 1s → π* transition of phenyl ether. In comparison with phenol and phenyl ether, the dependence of the fragmentation on the excitation site and destination state was weak in 1,3-diphenoxybenzene, likely as a result of delocalization of the valence electrons and rapid randomization of energy.

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Performance of an elliptically polarized undulator beamline

Cited by 14 publications

References 13 publications

Highly Selective Dissociation of a Peptide Bond Following Excitation of Core Electrons

Highly Selective Dissociation of a Peptide Bond Following Excitation of Core Electrons

Near-Edge X-ray Absorption Fine Structure Spectra and Site-Selective Dissociation of Phenol

Core Excitation, Specific Dissociation, and the Effect of the Size of Aromatic Molecules Connected to Oxygen: Phenyl Ether and 1,3-Diphenoxybenzene

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