Handling the carbon contamination issue at SOLEIL

Yao-Leclerc, I.; Brochet, Sylvain; Chauvet, C.; Oliveira, N. de; Duval, Jean-Pierre; Gil, J. F.; Kubsky, S.; Lagarde, Bruno; Nahon, Laurent; Nicolas, François; Sirotti, Fausto; Thomasset, Muriel

doi:10.1117/12.886970

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…The calculation of the Stokes parameters neglects the unpolarized component of light that might be attributed to transport optics with residual roughness and diffraction effects. The carbon contamination can alter the transmission ratio between horizontal and vertical polarization [44] more than what was predicted from uncontaminated optics and reported in Figure 3a. The off-axis emission may also contribute to the degradation of the degree of polarization.…”

Section: Resultsmentioning

confidence: 85%

Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

et al. 2017

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Abstract:The control of polarization state in soft and hard X-ray light is of crucial interest to probe structural and symmetry properties of matter. Thanks to their Apple-II type undulators, the FERMI-Free Electron Lasers are able to provide elliptical, circular or linearly polarized light within the extreme ultraviolet and soft X-ray range. In this paper, we report the characterization of the polarization state of FERMI FEL-2 down to 5 nm. The results show a high degree of polarization of the FEL pulses, typically above 95%. The campaign of measurements was performed at the Low Density Matter beamline using an electron Time-Of-Flight based polarimeter.

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Section: Resultsmentioning

confidence: 85%

Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

et al. 2017

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“…Since the experiments were carried out with vacuum level in the 10 −7 hPa range the deposition of the residual gas on the wires is inevitable. Even in ultrahigh vacuum condition of the synchrotron beamlines the carbon pollution of the optics is a serious problem and may result in a severe flux drop around the C (1s) edge [13]. Nevertheless, in these conditions it is clearly evidenced that it is possible to observe APECS for propanethiol above the S 2p edge in a reasonable time (11 h with electron count rates of 2 kHz).…”

Section: Methodsmentioning

confidence: 99%

Auger photoelectron coincidence spectroscopy of molecules adsorbed on a gold wire surface

Palaudoux,

Lablanquie,

Benbalagh

et al. 2024

J. Phys. B: At. Mol. Opt. Phys.

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In this paper, we present our initial results on Auger/PhotoElectron Coincidence Spectroscopy (APECS) of molecules - propanethiol and BSA (Bovine Serum Albumin) - deposited on gold wires, using a magnetic bottle electron time-of-flight spectrometer. This preliminary study was conducted under poor vacuum conditions in comparison to surface science standards. Nevertheless, it demonstrates the method's high efficiency and its potential for easy extension to various systems.

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“…A special care on the cleanness of the optics of the soft X-ray beamlines is needed to allow photoemission measurement at Carbon K edge with high photon flux. 33,34 Time resolved photoemission spectroscopy measured with time resolution of 50 ps as a function of laser flux has evidenced two photoexcitation processes. A rigid shift of the VB at high laser flux coming from space charge effect and a variation in intensity of the valence band at high energy attributed to a modification of the interface dipole.…”

Section: Hybrid Heterostructuresmentioning

confidence: 99%

High resolution and time resolved photoemission spectroscopy for developing more efficient materials to reduce energy consumption and increase renewable energy production

Silly

2022

EPJ Web Conf.

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Due to the increase of energy consumption and the resulting ecological challenge, a collective awareness leads to the development of renewable energies and more efficient materials to increase the green energy production. Development of efficient photovoltaic materials is very closely related to their chemical and electronic properties. A better knowledge of these imbricated properties is needed, in addition to a better comprehension of their interplay with charge transport mechanisms. Exciton creation and recombination processes, charge transfer and charge collection processes take place at the surface and interface of the photoactive materials. Photoemission spectroscopy as chemical specific and surface sensitive spectroscopic technique is a method of choice on the study of physical phenomena at the origin of photoconversion efficiency. Time resolved photoemission spectroscopy has been recently renewed interest covering time scale from fs to more than seconds. It permits to probe the dynamics of relaxation of photoexcited charges and determine their lifetime. It finds application in various materials used in solar photovoltaics. In this paper, we define the physical and chemical properties determined by the combination of high resolution and time resolved photoemission spectroscopy. We show examples dealing with the development of renewable energy and energy consumption reduction in agreement with the current ecological trend for a better future.

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Handling the carbon contamination issue at SOLEIL

Cited by 13 publications

References 10 publications

Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

Polarization Characterization of Soft X-Ray Radiation at FERMI FEL-2

Auger photoelectron coincidence spectroscopy of molecules adsorbed on a gold wire surface

High resolution and time resolved photoemission spectroscopy for developing more efficient materials to reduce energy consumption and increase renewable energy production

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