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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.

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Related Experiment Video

Updated: Apr 16, 2026

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source

Published on: April 23, 2021

A new extra-focus monochromator designed for high-performance VUV beamlines.

Chaofan Xue¹, Yanqing Wu¹, Ying Zou¹

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai Synchrotron Radiation Facility, Shanghai 201800, People's Republic of China.

Journal of Synchrotron Radiation

|February 28, 2015

Summary

A novel extra-focus constant-included-angle varied-line-spacing cylindrical-grating monochromator (CIA-VCGM) offers high performance. This advanced VLS grating design provides a fixed focus spot across a broad energy range, simplifying soft-X-ray applications.

Keywords:

VUV beamline monochromator

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Last Updated: Apr 16, 2026

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Published on: April 23, 2021

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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation

Published on: October 30, 2012

Area of Science:

Optics and Spectroscopy
Synchrotron Radiation Technology

Background:

Traditional varied-line-spacing (VLS) monochromators face limitations in focusing and energy range.
The Hettrick-Underwood scheme provides a foundation for advanced monochromator designs.

Purpose of the Study:

To introduce a new extra-focus constant-included-angle varied-line-spacing cylindrical-grating monochromator (extra-focus CIA-VCGM).
To achieve a zero-defocus condition at multiple photon energies in the vacuum-ultraviolet range.
To enhance performance and mechanical compatibility for broader applications.

Main Methods:

Replaced the plane VLS grating in the Hettrick-Underwood scheme with a cylindrical VLS grating.
Engineered the system to zero defocus at three specific reference photon energies.
Focused on a simple mechanical structure and fixed focus spot.

Main Results:

The extra-focus CIA-VCGM achieves a fixed focus spot with high performance over a wide energy range.
The design successfully zeros defocus at the specified vacuum-ultraviolet photon energies.
Demonstrated mechanical compatibility with standard VLS plane-grating monochromators.

Conclusions:

The extra-focus CIA-VCGM is a high-performance, simple-to-implement monochromator.
Its design enables convenient extension into the soft-X-ray range.
This advancement offers improved capabilities for spectroscopic applications.