Energy-filtered X-ray photoemission electron microscopy and its applications to surface and organic materials

Tsutsumi, Tetsuya; Miyamoto, Takeshi; Niimi, Hironobu; Kitajima, Yoshinori; Sakai, Yuji; Katô, Makoto; Naito, T.; Asakura, Kiyotaka

doi:10.1016/j.sse.2007.08.004

Cited by 8 publications

(2 citation statements)

References 40 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Paying attention to such unique features of molecular crystals, the control of conduction [19,20], or magnetism [21,22], or other physical properties [23][24][25][26][27][28] was carried out using photochemical redox reactions in solid states. In the reactions, photo-induced electron transfer occurs between two different kinds of molecular species in the crystal, e.g., the cations and the anions; one species is responsible for conduction and/or magnetism, and the other serves as the charge reservoir in high-T C cuprates [29].…”

Section: Introductionmentioning

confidence: 99%

Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light

2016

Self Cite

View full text Add to dashboard Cite

Electrical and magnetic properties are dominated by the (de)localization and the anisotropy in the distribution of unpaired electrons in solids. In molecular materials, these properties have been indirectly controlled through crystal structures using various chemical modifications to affect molecular structures and arrangements. In the molecular crystals, since the energy band structures can be semi-quantitatively known using band calculations and solid state spectra, one can anticipate the (de)localization of unpaired electrons in particular bands/levels, as well as interactions with other electrons. Thus, direct control of anisotropy and localization of unpaired electrons by locating them in selected energy bands/levels would realize more efficient control of electrical and magnetic properties. In this work, it has been found that the unpaired electrons on Cu(II)-complex anions can be optically controlled to behave as anisotropically-delocalized electrons (under dark) or isotropically-localized electrons like free electrons (under UV), the latter of which has hardly been observed in the ground states of Cu(II)-complexes by any chemical modifications. Although the compounds examined in this work did not switch between conductors and magnets, these findings indicate that optical excitation in the [Cu(dmit) 2 ] 2´s alts should be an effective method to control spin distribution and anisotropy.

show abstract

Section: Introductionmentioning

confidence: 99%

Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, we measured the Ag L 3 -edge X-ray absorption near-edge structure (XANES) of Ag(DMe-DCNQI) 2 to characterize the Ag valence state . Ag(DMe-DCNQI) 2 is a photosensitive organic conductor and a promising material for organic microdevices. − We found that Ag(DMe-DCNQI) 2 has a small but distinctive peak in the middle of the X-ray absorption edge. Behrens et al assigned the peak in the middle of the edge appearing at Ag 2 O to a 2p → 4d transition in which a d hole is created by the s−d hybridization through the covalent bond of the ligand. − …”

Section: Introductionmentioning

confidence: 99%

Ag L₃-Edge X-ray Absorption Near-Edge Structure of 4d¹⁰(Ag⁺) Compounds: Origin of the Edge Peak and Its Chemical Relevance

et al. 2010

Self Cite

View full text Add to dashboard Cite

A peak appearing at the L(2,3) X-ray absorption edge often provides the number of empty d states of the X-ray absorbing atoms. Ag(+) compounds have a d(10) state (no d empty states) but show a small peak at the edge. In this research, we systematically studied the edge peak of Ag(+) compounds to understand its origin on the basis of the molecular orbital picture and to obtain a relation of the edge peak intensity to chemical and physical quantities. The edge peak can be formally assigned to the transition from 2p to 5s enhanced by the s-d hybridization. The peak intensity has a negative correlation with a coordination charge but has a positive correlation with the strength of the covalent bond, which is in the reverse order to the other d(n) (n < 10) elements.

show abstract

OsO₂ as the Contrast‐Generating Chemical Species of Osmium‐Stained Biological Tissues in Electron Microscopy

Li,

Wildenberg,

Boergens

et al. 2024

ChemBioChem

View full text Add to dashboard Cite

Electron imaging of biological samples stained with heavy metals has enabled visualization of subcellular structures critical in chemical‐, structural‐, and neuro‐biology. In particular, osmium tetroxide OsO4 has been widely adopted for selective lipid imaging. Despite the ubiquity of its use, the osmium speciation in lipid membranes and the process for contrast generation in electron microscopy (EM) have continued to be open questions, limiting efforts to improve staining protocols and therefore high‐resolution nanoscale imaging of biological samples. Following our recent success using photoemission electron microscopy (PEEM) to image mouse brain tissues with synaptic resolution, we have used PEEM to determine the nanoscale electronic structure of Os‐stained biological samples. Os(IV), in the form of OsO2, generates nanoaggregates in lipid membranes, leading to a strong spatial variation in the electronic structure and electron density of states. OsO2 has a metallic electronic structure that drastically increases the electron density of states near the Fermi level. Depositing metallic OsO2 in lipid membranes allows for strongly enhanced EM signals and conductivity of biological materials. The identification of the chemical species and understanding of the membrane contrast mechanism of Os‐stained biological specimens provides a new opportunity for the development of staining protocols for high‐resolution, high‐contrast EM imaging.

show abstract

Energy-filtered X-ray photoemission electron microscopy and its applications to surface and organic materials

Cited by 8 publications

References 40 publications

Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light

Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light

Ag L₃-Edge X-ray Absorption Near-Edge Structure of 4d¹⁰(Ag⁺) Compounds: Origin of the Edge Peak and Its Chemical Relevance

OsO₂ as the Contrast‐Generating Chemical Species of Osmium‐Stained Biological Tissues in Electron Microscopy

Contact Info

Product

Resources

About

Energy-filtered X-ray photoemission electron microscopy and its applications to surface and organic materials

Cited by 8 publications

References 40 publications

Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light

Direct Control of Spin Distribution and Anisotropy in Cu-Dithiolene Complex Anions by Light

Ag L3-Edge X-ray Absorption Near-Edge Structure of 4d10(Ag+) Compounds: Origin of the Edge Peak and Its Chemical Relevance

OsO2 as the Contrast‐Generating Chemical Species of Osmium‐Stained Biological Tissues in Electron Microscopy

Contact Info

Product

Resources

About

Ag L₃-Edge X-ray Absorption Near-Edge Structure of 4d¹⁰(Ag⁺) Compounds: Origin of the Edge Peak and Its Chemical Relevance

OsO₂ as the Contrast‐Generating Chemical Species of Osmium‐Stained Biological Tissues in Electron Microscopy