Related Experiment Video
Updated: Jul 8, 2026
09:00
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Development of spin-polarized ion scattering spectroscopy
Taku Suzuki1, Yasushi Yamauchi
1National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan. suzuki.taku@nims.go.jp
Summary
A new spin-polarized ion scattering spectroscopy technique was developed. This method analyzes element-selective spin states at surfaces, successfully observing spin dependence on an iron surface.
Area of Science:
- Surface science
- Atomic physics
- Spectroscopy
Background:
- Analyzing element-selective spin states at outermost surfaces is crucial for understanding surface phenomena.
- Existing methods may lack the necessary sensitivity or specificity for detailed spin state analysis.
Purpose of the Study:
- To develop a novel analytical method for determining element-selective spin states at outermost surfaces.
- To investigate the generation and optimization of spin-polarized helium ions (He+) for surface analysis.
Main Methods:
- Developed spin-polarized ion scattering spectroscopy using an electron-spin-polarized 4He+ ion beam.
- Generated spin-polarized He+ ions via optical pumping (OP) of metastable He 2(3)S1 atoms (He*).
- Optimized OP radiation density to maximize He* spin polarization (PHe*).
Main Results:
- Identified an optimal OP radiation density of approximately 0.05 W cm(-2) for maximum PHe*.
- Observed a decrease in PHe* at higher OP radiation densities, attributed to imperfect OP radiation polarization.
- Successfully detected the spin dependence of scattered He+ ion yield on an oxygen-exposed Fe(100) surface.
Conclusions:
- Spin-polarized ion scattering spectroscopy is a viable technique for analyzing surface spin states.
- Optimization of optical pumping parameters is critical for achieving high spin polarization in He+ ions.
- The developed method enables the study of spin-dependent interactions at material surfaces.
Related Concept Videos
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
01:16Mass Spectrometers
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
01:08NMR Spectroscopy: Spin–Spin Coupling
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
01:12Electrospray Ionization (ESI) Mass Spectrometry
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
01:19Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then passed on to...
01:03Atomic Nuclei: Nuclear Spin State Overview
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...