A capillary discharge tube for the production of intense VUV resonance radiation

Schönhense, G.; Heinzmann, Ulrich

doi:10.1088/0022-3735/16/1/015

Cited by 39 publications

(10 citation statements)

References 36 publications

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“…Figure 1 shows the schematic setup of the apparatus. The vacuum ultraviolet (VUV) lamp 15 and the cylindrical-mirror-analyzer electron spectrometer are necessary for photoelectron spectroscopy. The main parts of the source of oriented molecules are the supersonic beam source, the electrostatic hexapole, and the guiding field; in between a buffer field is placed.…”

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confidence: 99%

Experimental angular-resolved photoelectron spectroscopy of free orientedCH3I molecules

1985

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A photoionization experiment on free oriented molecules in the gas phase has been performed. CH3I molecules in a supersonic beam have been oriented with respect to the molecular axis parallel to an external field by use of an electric hexapole. The photoelectrons ejected by vacuum ultraviolet radiation in a region of a very weak field from the lone-pair orbital located at the iodine atom show a pronounced asymmetry depending on whether electrons are emitted parallel or antiparallel to the molecular axis.PACS numbers: 33.80.Eh, 33.60.CvRecent photoemission experiments with atoms, 1 molecules, 2 or solids 3 have shown that details of the photoionization dynamics can be obtained if the photoelectron spectroscopy studies are performed in an angular-and/or even spin-resolved manner. In molecular photoionization, however, still much detailed information was hidden because only randomly oriented molecules could be photoionized in previous gas-phase experiments. Theoretical investigations into the study of photoelectron emission of free oriented molecules became very important and have been successfully performed 4 " 8 after there was experimental evidence 9 that photoemission from molecules chemisorbed on a solid-state surface reflects the orientation of the molecules with respect to the surface. To close the gap between photoionization of randomly oriented molecules in the gas phase and of oriented molecules in the chemisorption requires experimental studies of the influence of the molecular orientation onto the molecular photoemission process. We present for the first time experimental results of an angular-resolved photoelectron spectroscopy study on free oriented molecules in the gas phase.Diatomic closed-shell molecules with permanent electric dipole moment /x rotate perpendicularly to /x, so that their orientation requires enormous electric fields (~~ 10 7 V/cm) to overcome the rotational inertia of the molecules. 10 " 12 However, symmetric top molecules like CH 3 I can have rotational states, where the rotational momentum J has a component parallel to /ut, i.e., symmetric tops in these rotational states can be oriented in lower electric fields, which is a critical requirement in our photoionization experiment. The experimental technique corresponds to an ''electrostatic Stern-Gerlach method" 10 " 14 with use of an electrostatic hexapole. Figure 1 shows the schematic setup of the apparatus. The vacuum ultraviolet (VUV) lamp 15 and the cylindrical-mirror-analyzer electron spectrometer are necessary for photoelectron spectroscopy. The main parts of the source of oriented molecules are the supersonic beam source, the electrostatic hexapole, and the guiding field; in between a buffer field is placed. The interaction energy of a CH 3 I molecule with an electric field E is 13where 9 is the angle between /JL and E, and 7, K, and Mj are the rotational quantum numbers. 14 The force G = -grad H^S tark onto the molecules in the inhomogeneous electric field of the hexapole separates molecules with different orientation of the...

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confidence: 99%

Experimental angular-resolved photoelectron spectroscopy of free orientedCH3I molecules

1985

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“…The 40.8 eV lines which are most intensive of the He II radiation are close to the electron-electron scattering threshold in solid Ne and fit, thus, the expected minimum of the photoemission line shape. Moreover, comparison of the 21.22 eV He I and 40.8 eV He II photon fluxes reported in the literature [54,57,58] shows that the latter one is 1-3 orders below the former one, making negligible contribution to the photoemission from solid Ne.…”

Section: Resultsmentioning

confidence: 79%

“…The spectrum in Fig. 2 of the paper [57] shows no signs of 61-62 nm emission lines thus testifying their low intensity. In Ref.…”

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confidence: 86%

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ECR study of electron photoemission from gas solids

Dmitriev

2013

Physica B: Condensed Matter

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“…Please note that the background subtraction routine for the measurement with the He-II line is slightly modified by first subtracting a background of spinresolved photoelectrons, which are excited by satellite spectral lines. 37 The measured spectra (I ± ) have been fitted with the convolution of a Gaussian peak function and the product of a Fermi-Dirac distribution (T = 300 K) with another Gaussian peak function. Here, the first Gaussian function represents the combined energy resolution due to the spectrometer and the light source.…”

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confidence: 99%

Spin-resolved photoelectron spectroscopy using femtosecond extreme ultraviolet light pulses from high-order harmonic generation

Adam

Weier

Pluciński

et al. 2016

Review of Scientific Instruments

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The fundamental mechanism responsible for optically induced magnetization dynamics in ferromagnetic thin films has been under intense debate since almost two decades. Currently, numerous competing theoretical models are in strong need for a decisive experimental confirmation such as monitoring the triggered changes in the spin-dependent band structure on ultrashort time scales. Our approach explores the possibility of observing femtosecond band structure dynamics by giving access to extended parts of the Brillouin zone in a simultaneously time-, energy-and spin-resolved photoemission experiment. For this purpose, our setup uses a state-of-the-art, highly efficient spin detector and ultrashort, extreme ultraviolet light pulses created by laser-based high-order harmonic generation. In this paper, we present the setup and first spin-resolved spectra obtained with our experiment within an acquisition time short enough to allow pump-probe studies. Further, we characterize the influence of the excitation with femtosecond extreme ultraviolet pulses by comparing the results with data acquired using a continuous wave light source with similar photon energy. In addition, changes in the spectra induced by vacuum space-charge effects due to both the extreme ultraviolet probe-and near-infrared pump-pulses are studied by analyzing the resulting spectral distortions. The combination of energy resolution and electron count rate achieved in our setup confirms its suitability for spin-resolved studies of the band structure on ultrashort time scales. Published by AIP Publishing. [http://dx

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A capillary discharge tube for the production of intense VUV resonance radiation

Cited by 39 publications

References 36 publications

Experimental angular-resolved photoelectron spectroscopy of free orientedCH3I molecules

Experimental angular-resolved photoelectron spectroscopy of free orientedCH3I molecules

ECR study of electron photoemission from gas solids

Spin-resolved photoelectron spectroscopy using femtosecond extreme ultraviolet light pulses from high-order harmonic generation

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