UV–VIS–NIR (Ultraviolet–Visible–Near Infrared) Spectroscopy
introduction
Ultraviolet (UV) radiation is part of the electromagnetic spectrum, located after visible light and before X-rays. UV radiation is used in various scientific and industrial fields, and it has important applications in physics. Ultraviolet radiation is a powerful tool in physics and materials science. By understanding its properties and uses, scientists and researchers can explore new fields and improve technological and medical applications.
UV–VIS–NIR (Ultraviolet–Visible–Near Infrared) Spectroscopy is a powerful optical technique used to analyze the optical and electronic properties of materials. At Photon Center, we offer high-precision spectral analysis across the 175–3300 nm wavelength range, suitable for a wide range of materials and applications
Test Principle:
When an electromagnetic beam interacts with a sample, certain frequencies are absorbed, weakening the beam. Every material has unique absorption mechanisms, and when the outgoing beam is analyzed using a prism, the intensity of each wavelength is measured by a detector. The results are displayed as a graph, which helps identify the compounds present in the sample.
The absorption intensity depends on the concentration of the substance, allowing UV-Vis spectroscopy to be used for comparing different quantities or measuring concentrations. The relationship between absorption and concentration follows the Beer-Lambert law, which states that absorption is proportional to the path length and concentration of the substance.
This law also applies to multi-component solutions, provided that there are no interactions between different species. At high concentrations, particle interactions may affect absorption capacity, requiring these factors to be considered.
Applications of Ultraviolet Radiation in Physics:
Band Gap Determination
Estimation of the optical band gap in semiconductors, nanomaterials, and thin films using Tauc plots and absorption edge analysis.
Absorbance and Transmittance Measurement
Evaluation of light absorption and transmission properties, crucial for optical coatings, sensors, and photovoltaic materials.
Reflectance Spectroscopy
Used for opaque or scattering samples to understand surface and bulk optical behavior.
Color and Transparency Evaluation
Especially useful in materials used for lenses, coatings, and display technologies.
Optical Constants (n & k)
Deriving the refractive index and extinction coefficient across wavelengths, particularly when coupled with other techniques like ellipsometry.
Spectroscopic Analysis: UV radiation is used in spectroscopic analysis to study materials. Absorption or emission in the UV range is measured to determine the chemical composition of compounds.
Photocatalysis: In physical research, UV radiation is used to stimulate chemical reactions. For example, UV can initiate polymer reactions or chemical decomposition.
Material Detection: UV radiation is employed to detect chemical substances in various environments. UV light can reveal organic compounds that are not visible under visible light.
Applications in Particle Physics:
Particle Physics Experiments: UV radiation is used in particle physics experiments to study the properties of particles and interactions, as it can lead to the emission of other particles or radiation.
Supported Sample Types:
Thin films on various substrates (glass, quartz, silicon, etc.)
Nanoparticles and colloidal solutions
Powders and bulk materials
Transparent and semi-transparent polymers
Coatings, composites, and hybrid structures
Features of test:
Full-spectrum range (175–3300 nm)
High-resolution data acquisition
Customizable scanning speed and slit width
Measurements under ambient or inert conditions
Compatible with transmission, reflection, and absorbance modes