VUV high resolution and high flux beamline for chemical dynamics studies at the advanced light source

Koike, Masato; Heimann, Philip; Kung, A. H.; Namioka, Takeshi; DiGennaro, R.; Gee, B.; Yu, Ning

doi:10.1016/0168-9002(94)91893-7

Cited by 39 publications

(23 citation statements)

References 6 publications

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“…The properties of the VUV undulator radiation used in these experiments have been described in detail [28,29]. All measurements were conducted at 1.9 GeV electron beam energy, where the low end of the useable VUV radiation range is below 8 eV.…”

Section: Pi Instrumentmentioning

confidence: 99%

Photofragment translational spectroscopy of allene, propyne, and propyne-d3 at 193 nm

et al. 2005

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The dissociation dynamics of allene, propyne, and propyne-d 3 at 193 nm were investigated with photofragment translational spectroscopy. Products were either photoionized using tunable VUV synchrotron radiation or ionized with electron impact. Product time-of-flight data were obtained to determine centre-of-mass translational energy (P(E T )) distributions, and photoionization efficiency (PIE) curves were measured for the hydrocarbon products. The two major product channels evident from this study are atomic and molecular hydrogen loss, with a H:H 2 branching ratio of 90:10, regardless of precursor. The P(E T ) distribution for each channel is also largely independent of precursor. Both channels appear to occur following internal conversion to the ground electronic state. The propyne-d 3 results show that there is extensive isotopic scrambling prior to H(D) atom loss, and that the H:D product ratio is approximately unity. The PIE curves for H(D) atom loss from allene, propyne, and propyne-d 3 indicate that the dominant corresponding C 3 H 3 product is the propargyl radical in all cases. There is some evidence from the PIE curves that the dominant C 3 H 2 products from allene and propyne are propadienylidene (H 2 CCC:) and propargylene (HCCCH), respectively.

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Section: Pi Instrumentmentioning

confidence: 99%

Photofragment translational spectroscopy of allene, propyne, and propyne-d3 at 193 nm

et al. 2005

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“…47 The spot size is predicted to be 240 µm vertically by 360 µm horizontally Photoionization intensity is in the range of 1010-1011, about an order of magnitude lower than the predicted intensity. A third, 2400 lines/mm holographic grating with varied line spacing has also been fabricated and tested.…”

Section: Performance Of the Monochromator Systemmentioning

confidence: 97%

Advances in Photoionization and Photoelectron Studies Using Third Generation Synchrotron Radiation and Uv/Vuv Lasers

2000

Photoionization and Photodetachment

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394 Photoionization and Photodetachment Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 09/30/15. For personal use only. Advances in Photoionization and Photoelectron Studies ... 395 2.3.3. Rotational-resolved PFI-PE bands for Oa (b4E9 , 22IIu, B2Ey 2Eu , c4E) 437 2.3.3.1 . O (b4Ey,v += 0-9) 438 2.3.3.2. O2 (B2E; , v+ = 0 -7) 449 2.3.3.3. O (22IIu , 2E,.) 461 2.3.3.4. O9 (c4Eu , v+ = 0,1) 467 2.3.4. Rotational-resolved PFI-PE Bands for H2 (X2E9v+ = 0 -18) 474 2.3.5. Satellite States of Xe+ at 23-25 eV 482 2.4. Threshold Photoelectron-Photoion Coincidence Study 485 2.4.1. SFs+ 485 3. UV/VUV Laser Studies 489 3.1. Experimental Considerations 489 3.1.1. VUV-PIE and VUV-PFI-PE Measurements 489 3.1.2. N2P-PIE and N2P-PFI-PE Measurements 491 3.2. CS2 (X2113 /2,1/2; vi , v2 , v3) 491 3.2.1. Stark and VUV-PIE Spectra 492 3.2.2. VUV-PFI-PE Spectrum 497 3.2.3. Vibronic Band Intensities of VUV-PFI-PE, N2P-PFI-PE, and TPE Spectra 502 3.3. CH3SH+, CH3CH2SH+, and CH3SCH3 503 3.3.1. Ab initio Calculations 504 3.3.2. N2P-PIE and N2P-PFI-PE Spectra for CH3SH and CH3CH2SH 504 3.3.2.1. CH3SH+ 504 3.3.2.2 . CH3CH2SH+ 507 3.3.3. VUV-PFI-PE Spectra of CH3SH and CH3CH2SH 514 3.3.4. VUV-PFI-PE and N2P-PFI-PE Spectra for CH3SCH3 521 4. Conclusions and Future Developments 528 Acknowledgments 531 References 531 Photoionization and Photodetachment Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 09/30/15. For personal use only.Parallel to the development of TPE spectroscopic techniques using cw VUV light sources, photoelectron studies using pulsed laser based techniques have achieved resolutions close to the optical bandwidth by employing the delayed pulsed field ionization (PFI)-photoelectron (PFI-PE) method .7,26,27 This method, pioneered by Dethlef and Schlag , is becoming the method of choice for laser based photoelectron studies . The PFI-PE Photoionization and Photodetachment Downloaded from www.worldscientific.com by NANYANG TECHNOLOGICAL UNIVERSITY on 09/30/15. For personal use only. high-n (n > 100) Rydberg states populated by laser excitation. Since these high-n Rydberg states converge to the IE of interest , the observed PFI-PE peak is slightly below the true IE. In addition to single -photon excitation using VUV lasers, excitation to high-n Rydberg states can also be accomplished by resonant or non-resonant two-photon (N2P) schemes .28,29 The non-resonant two-photon PFI-PE scheme is especially attractive because it only requires a tunable dye laser in the UV range, which is readily available to most modern laboratories . For specific molecular species with IE values below 12 eV, the N2P-PFI-PE scheme is a useful method for highresolution photoelectron measurements. Since the N2P process requires considerable laser fluences, the occurrence of dissociation and multiphoton ionization processes can cause complications in N2P-PFI studies . Significant fragmentation of parent photoions due to absorption of additional photons has been shown to prevent the measurement of the p...

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“…SU5 est la seule ligne VUV visant à la fois la haute résolution et le dichroïsme. Certaines lignes, telle la ligne Chemical Dynamics Facility (CDF) de l'Advanced Light Source (ALS) basée sur un onduleur plan [2,3], ont obtenues de la haute résolution avec un fort flux grâce à des monochromateurs (pouvoir résolvant de 70000), tandis que d'autres ont utilisé des spectromètres à réseaux fixes pour faire des expériences d'absorption à ultra-haute résolution (pouvoir résolvant de 250000) [4]. Par ailleurs, les seules lignes VUV avec "polarisations exotiques" se sont jusqu'à présent limitées au seul usage du Rayonnement Synchxotron (RS) hors du plan produit dans un aimant de courbure [5] avec un compromis entre le flux et le taux de polarisation.…”

Section: Introductionunclassified

Performances obtenues sur SU5 : une ligne VUV à haute résolution et à polarisation variable

Nahon

2001

J. Phys. IV France

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Résumé : La ligne de lumière VUV SU5 répond à un double cas scientifique : la spectroscopie à haute résolution sur des espèces diluées et le dichroïsme linéaire/circulaire sur des systèmes anisotropes. Un onduleur croisé plan/hélicoïdal électromagnétique a été conçu et construit, produisant des polarisations variables avec un fort flux. Nous avons montrés la grande polyvalence des états de polarisation de la lumière produite, avec des taux d; polarisation élevés. Par ailleurs, les harmoniques de l'onduleur peuvent être supprimées grâce à un filtre à gaz, agissant comme un filtre passe-bas en énergie, avec des taux de réjection supérieurs à 10 5 . La ligne est centrée autour d'un monochromateur à incidence normale du type "Eagle off-plane" qui a atteint des pouvoirs résolvants bruts sans précédent (117000 à 21.6 eV, 133000 à 15.8 eV) avec des flux typiques dans une bande passante de 1/50000 ce l'ordre de 10'° à 10 9 entre 6 et 30 eV.

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VUV high resolution and high flux beamline for chemical dynamics studies at the advanced light source

Cited by 39 publications

References 6 publications

Photofragment translational spectroscopy of allene, propyne, and propyne-d3 at 193 nm

Photofragment translational spectroscopy of allene, propyne, and propyne-d3 at 193 nm

Advances in Photoionization and Photoelectron Studies Using Third Generation Synchrotron Radiation and Uv/Vuv Lasers

Performances obtenues sur SU5 : une ligne VUV à haute résolution et à polarisation variable

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