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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Related Experiment Video

Updated: Jan 14, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Interface-induced collective phase transition in VO2-based bilayers studied by layer selective spectroscopy.

D Shiga1,2, S Inoue3, T Kanda3

  • 1Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai, 980-8577, Japan. dshiga@tohoku.ac.jp.

Scientific Reports
|October 21, 2025
PubMed
Summary
This summary is machine-generated.

The interface between insulating and metallic vanadium dioxide (VO2) layers drives collective electronic phase transitions. This study reveals how interfacial energy balances bulk properties to control these transitions in VO2 bilayers.

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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Vanadium dioxide (VO2) exhibits temperature-dependent phase transitions crucial for electronic devices.
  • Understanding interface effects is key to controlling VO2 phase transitions.

Purpose of the Study:

  • Investigate the origin of collective electronic phase transitions at the VO2 heterointerface.
  • Determine how interface formation influences the electronic structure and phase behavior of VO2 layers.

Main Methods:

  • Utilized in situ soft X-ray photoemission spectroscopy (PES) and X-ray absorption spectroscopy (XAS).
  • Examined nanoscale VO2/V0.99W0.01O2 (001)R bilayers with layer-selective surface sensitivity.
  • Performed detailed temperature-dependent measurements.

Main Results:

  • The monoclinic insulating VO2 layer transitions to a rutile metallic phase upon heterointerface formation.
  • The rutile metallic VO2 layer transitions back to the monoclinic insulating phase upon cooling.
  • Phase transitions involve in-plane phase separation between metallic and insulating domains.

Conclusions:

  • Interface-induced transitions in VO2 bilayers are collective phenomena.
  • These transitions result from a balance between interfacial energy and bulk free energies.
  • The findings offer insights into designing advanced VO2-based electronic devices.