Flat Field Soft X-ray Spectrometry with Reflection Zone Plates on a Curved Substrate

Probst, J.; Braig, Christoph; Erko, Alexei

doi:10.3390/app10207210

Cited by 11 publications

(13 citation statements)

References 7 publications

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“…With its diameter of (13.0 − 15.5) mm and a length of 100 mm, this Au-coated optic provides an acceptance solid angle of 2.2 msr and a reflectivity of ≈ 74 % (CXRO), assuming a surface roughness of ±1 nm (rms). Using an RZP on a plane substrate to disperse the convergent beam in its (+1) st diffraction order on the detector, the Hettrick-Underwood 6 principle is implemented to yield a 46-fold enhanced photon flux, compared to our initial, [3][4][5] "grating-only" design. The overall layout, as sketched in Fig.…”

Section: Optical Design and Wavefront Correctionmentioning

confidence: 99%

“…2 Recently, we demonstrated high-resolution soft X-ray spectroscopy on TiO 2 over a wide energy range in our lab. [3][4][5] However, the most of the low photon flux from table-top X-ray sources 1 should be made, using an efficient configuration. In this paper, we report on a meter-sized spectrometer being improved not only in this way, but also toward an enhanced resolving power.…”

Section: Introductionmentioning

confidence: 99%

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Soft X-ray spectroscopy in the lab with an ellipsoidal mirror and a wavefront corrected reflection zone plate

Probst¹,

Löchel²,

Krist³

et al. 2023

EUV and X-Ray Optics: Synergy Between Laboratory and Space VIII

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We present first experimental results on wavelength-dispersive soft X-ray spectroscopy of TiO2 in the vicinity of the Ti Lσ fluorescence line with a central energy of about 452.2 eV, demonstrating the functionality of a newly developed, laboratory-scaled setup. In our instrument, the micron-sized photon emission from an electronexcited source is collected efficiently by a rotationally symmetric, ellipsoidal mirror and subsequently dispersed by a reflection zone plate with inscribed diffractive wavefront correction, to compensate for figure and alignment errors of the ellipsoid to some degree. The measured data, recorded with a CCD camera in one meter from the source, show clearly separated peaks from different Ti L (398.3 eV and 452.2 eV) contributions and O Kα emission (523.1 eV) with an energy resolving power around 38 and a signal-to-noise ratio between 4.4 and 10.7.

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Section: Optical Design and Wavefront Correctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soft X-ray spectroscopy in the lab with an ellipsoidal mirror and a wavefront corrected reflection zone plate

Probst¹,

Löchel²,

Krist³

et al. 2023

EUV and X-Ray Optics: Synergy Between Laboratory and Space VIII

View full text Add to dashboard Cite

show abstract

“…This enables recording a spectrum with retaining one dimension for spatial imaging, similar to commonly used Varied Line-Spaced (VLS) grating. In contrast to a VLS, an RZP on a curved substrate offers a high efficiency up to 25% in a large spectral range covering photon energies of up to 1300 eV [58].…”

Section: Reflection Zone Plate Opticsmentioning

confidence: 99%

“…To overcome this limitation, a special "misalignment" technique has been proposed tuning the focused wavelength of a planar RZP over a broader spectral range [50,57]. Another option to obtain a high spectral resolution over a wide photon energy range is to fabricate RZP structures on a spherical substrate [58]. In contrast to an RZP on a planar substrate, the new design allows a high spectral resolution of up to ΔE/E = 1000 on the detector for a wide spectral range (designenergy ± 50%) without an energy-dependent spatial and spectral limited focusing.…”

Section: Reflection Zone Plate Opticsmentioning

confidence: 99%

Towards Understanding Excited-State Properties of Organic Molecules Using Time-Resolved Soft X-ray Absorption Spectroscopy

Stiel

Braenzel

Jonas

et al. 2021

IJMS

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The extension of the pump-probe approach known from UV/VIS spectroscopy to very short wavelengths together with advanced simulation techniques allows a detailed analysis of excited-state dynamics in organic molecules or biomolecular structures on a nanosecond to femtosecond time level. Optical pump soft X-ray probe spectroscopy is a relatively new approach to detect and characterize optically dark states in organic molecules, exciton dynamics or transient ligand-to-metal charge transfer states. In this paper, we describe two experimental setups for transient soft X-ray absorption spectroscopy based on an LPP emitting picosecond and sub-nanosecond soft X-ray pulses in the photon energy range between 50 and 1500 eV. We apply these setups for near-edge X-ray absorption fine structure (NEXAFS) investigations of thin films of a metal-free porphyrin, an aggregate forming carbocyanine and a nickel oxide molecule. NEXAFS investigations have been carried out at the carbon, nitrogen and oxygen K-edge as well as on the Ni L-edge. From time-resolved NEXAFS carbon, K-edge measurements of the metal-free porphyrin first insights into a long-lived trap state are gained. Our findings are discussed and compared with density functional theory calculations.

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“…The main references concerning a possible optical layout solution is the RZPA spectrometer as published in [7,8]. Recent advancements with RZPAs on a spherical substrate are reported in [9]. As an option, the RZPA provides up to four different RZPs, each with the same resolving power, together covering the energy range (150 -700) eV with HHG source and (210 -1400) eV with LPP source.…”

Section: Reflection Zone Plate Spectrometermentioning

confidence: 99%

Ultrafast NEXAFS spectroscopy in the lab using laser-based sources and advanced X-ray optics

Stiel

Braenzel

Tuemmler

et al. 2021

International Conference on X-Ray Lasers 2020

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Laboratory based laser driven short pulse X-ray sources like laser produced plasmas (LPP) and high harmonic generation (HHG) exhibit a great potential for spectroscopy in the soft X-ray range. These sources are complementary to large scale facilities like synchrotrons or free electron lasers. For applications of LPP or HHG sources for time-resolved X-ray absorption spectroscopy in the water window or beyond a high photon flux is crucial. The available photon flux strongly depends on energy, pulse duration and repetition rate of the pump laser. Depending on the experimental needs in timeresolved experiments pulse durations of the X-ray pulse ranging from nanoseconds to sub-femtoseconds are required. In our contribution we will present a highly brilliant LPP source emitting soft X-rays in the photon energy range between 50 and 1500 eV based on CPA and thin disk laser technology as well as the high average power thin disk laser based OPCPA system for high photon flux HHG. In addition we present a new generation of reflection zone plates on spherical substrates, that promises a remarkable high resolution over a wide spectral range making it an ideal and highly efficient diffractive optic for time-resolved NEXAFS experiments in the lab.

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Flat Field Soft X-ray Spectrometry with Reflection Zone Plates on a Curved Substrate

Cited by 11 publications

References 7 publications

Soft X-ray spectroscopy in the lab with an ellipsoidal mirror and a wavefront corrected reflection zone plate

Soft X-ray spectroscopy in the lab with an ellipsoidal mirror and a wavefront corrected reflection zone plate

Towards Understanding Excited-State Properties of Organic Molecules Using Time-Resolved Soft X-ray Absorption Spectroscopy

Ultrafast NEXAFS spectroscopy in the lab using laser-based sources and advanced X-ray optics

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