A 10m-normal incidence monochromator at the quasi-periodic undulator U125-2 at BESSY II

Reichardt, G.; Bahrdt, J.; Schmidt, Jan-Simon; Gudat, W.; Ehresmann, A.; Müller-Albrecht, R.; Molter, H.; Schmoranzer, H.; Martins, M.; Schwentner, N.; Sasaki, Shigemi

doi:10.1016/s0168-9002(01)00359-x

Cited by 62 publications

(32 citation statements)

References 3 publications

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“…29), which consists of 32 dipole magnet periods each 125 mm long, in combination with the 10 m focal length normal incidence monochromator (NIM). 30 In order to achieve maximum photon flux a relatively low resolution of 300 lines/mm grating was employed.…”

Section: Methodsmentioning

confidence: 99%

Photodissociation of protonated leucine-enkephalin in the VUV range of 8–40 eV

Bari

González-Magaña

Reitsma

et al. 2011

The Journal of Chemical Physics

116

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Until now, photodissociation studies on free complex protonated peptides were limited to the UV wavelength range accessible by intense lasers. We have studied photodissociation of gas-phase protonated leucine-enkephalin cations for vacuum ultraviolet (VUV) photons energies ranging from 8 to 40 eV. We report time-of-flight mass spectra of the photofragments and various photofragmentyields as a function of photon energy. For sub-ionization energies our results are in line with existing studies on UV photodissociation of leucine-enkephalin. For photon energies exceeding 10 eV we could identify a new dissociation scheme in which photoabsorption leads to a fast loss of the tyrosine side chain. This loss process leads to the formation of a residual peptide that is remarkably cold internally.

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Section: Methodsmentioning

confidence: 99%

Photodissociation of protonated leucine-enkephalin in the VUV range of 8–40 eV

Bari

González-Magaña

Reitsma

et al. 2011

The Journal of Chemical Physics

116

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“…Recently, a 10 m-NIM monochromator has been started up at BESSY II [27]. It is positioned at the UE-125 undulator front end.…”

Section: Methodsmentioning

confidence: 99%

“…The entrance (S 1 ) and exit (S 2 ) slits were adjusted between 5 µ m and 25 µm. In optimal operating conditions a resolving power of 125 000 is expected and 114 000 is obtained at hv ≈ 20eV [27], the monochromator being optimized for photon energies hv ≥ 15 eV. However, at lower energy, i.e., hv ≤ 10 eV, the transmitted intensity becomes low.…”

Section: Methodsmentioning

confidence: 99%

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Medium and high resolution vacuum UV photoabsorption spectroscopy of methyl iodide (CH3I) and its deuterated isotopomers CD3I and CH2DI. A Rydberg series analysis

et al. 2009

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The vacuum UV photoabsorption spectrum of CH 3 I has been investigated between 5 eV and 20 eV. Numerous vibronic transitions are observed. In the high 10-20 eV photon energy range weak to very weak diffuse bands are observed and ascribed to electronic transitions from 3a 1 , 1e and 2a 1 to Rydberg orbitals. In the 6-10.5 eV photon energy range more than 200 sharp and strong to weak lines have been observed. Several photon energy ranges were explored under high resolution conditions allowing us to observe many series up to high values of the principal quantum number n. They are assigned to vibration-less Rydberg transitions and classified into two groups converging to the two components of the spin-orbit split X 2 E state of CH 3 I + . These two groups consist of six different Rydberg series, i.e., nsa 1 , npa 1 , npe, nda 1 , nde and nf. A very close correlation has been established between the term values of the Rydberg states in CH 3 I and in Xe for ns, np, nd and nf Rydberg transitions. For the first time, the same measurements have been performed and the interpretation has been proposed for the photoabsorption spectrum of CH 2 DI and CD 3 I in the 6-10.5 eV photon energy range. For these two species, ionization energies are deduced: for the X 2 E 3/2 and X 2 E 1/2 states of CH 2 DI, these are IE ad = 9.544 eV and IE ad = 10.168 eV, respectively, and the corresponding energies are 9.552 eV and 10.173 eV in CD 3 I.

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“…The decisive advantages of this type of monochromator design are that only small aberration errors occur and highest resolution can be easily achieved. The 10m-NIM beamline (Reichardt et al, 2001) was designed for the quasi-periodic undulator U125-2 . In this special kind of undulator source the period of the magnets is structured in a way that higher orders are suppressed.…”

Section: Introductionmentioning

confidence: 99%

The U125-2 NIM beamline at BESSY II

Baumgärtel

Packe

2016

JLSRF

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Optical design and technical data of the high-resolution normal incidence monochromator (NIM) beamline U125-2 NIM are presented. IntroductionNormal incidence monochromators (NIM) are typically used in synchrotron beamlines which are dedicated to experiments operating in an energy range of about 4 to 35 eV only. The decisive advantages of this type of monochromator design are that only small aberration errors occur and highest resolution can be easily achieved. The 10m-NIM beamline (Reichardt et al., 2001) was designed for the quasi-periodic undulator U125-2 (Bahrdt et al., 2001). In this special kind of undulator source the period of the magnets is structured in a way that higher orders are suppressed. The design of the beamline's monochromator is based on the so called o -Rowland circle mounting design (Samson, 1967). This implies that the grating has to be rotated and slightly translated in order to get the highest resolution and a small spot size in the experiment.* Cite article as: Helmholtz-Zentrum Berlin für Materialien und Energie. (2016). The U125-2 NIM beamline at BESSY II.Journal of large-scale research facilities, 2, A53. http://dx

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A 10m-normal incidence monochromator at the quasi-periodic undulator U125-2 at BESSY II

Cited by 62 publications

References 3 publications

Photodissociation of protonated leucine-enkephalin in the VUV range of 8–40 eV

Photodissociation of protonated leucine-enkephalin in the VUV range of 8–40 eV

Medium and high resolution vacuum UV photoabsorption spectroscopy of methyl iodide (CH3I) and its deuterated isotopomers CD3I and CH2DI. A Rydberg series analysis

The U125-2 NIM beamline at BESSY II

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