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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
UV–Vis Spectrometers01:14

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. Samples for...
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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A rotating-compensator based reflectance difference spectrometer for fast spectroscopic measurements.

C G Hu1, L D Sun, J M Flores-Camacho

  • 1State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Weijin Road, 300072 Tianjin, China.

The Review of Scientific Instruments
|May 6, 2010
PubMed
Summary

A new rotating-compensator reflectance difference (RC-RD) spectrometer enables rapid, high-quality spectroscopic measurements. This advanced instrument is ideal for real-time monitoring of thin film growth processes.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Surface Science

Background:

  • Reflectance Difference (RD) spectroscopy is a powerful technique for studying surfaces and interfaces.
  • Existing RD spectrometers can be slow, limiting their application for dynamic processes.

Purpose of the Study:

  • To develop a novel, fast RD spectrometer using a rotating-compensator (RC) design.
  • To enable simultaneous multiwavelength detection for rapid data acquisition.
  • To demonstrate the instrument's capability for in situ, real-time monitoring of thin film growth.

Main Methods:

  • Implementation of a rotating-compensator (RC) design for RD spectroscopy.
  • Utilization of a 1024-element silicon photodiode linear array for simultaneous multiwavelength detection.
  • Development of algorithms for data collection and reduction.

Main Results:

  • High-quality RD spectra obtained in seconds over a 1.5 to 4.5 eV spectral range.
  • Successful in situ, real-time monitoring of initial organic thin film growth (para-sexiphenyl on Cu(110)).
  • Analysis of errors associated with lamp instability and compensator imperfections.

Conclusions:

  • The developed RC-RD spectrometer offers a significant advancement in speed and data acquisition for spectroscopic measurements.
  • The instrument is well-suited for real-time surface analysis and thin film growth studies.
  • This technology provides a valuable tool for materials science research and development.