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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to 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...
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Unobtrusive interferometer tracking by path length oscillation for multidimensional spectroscopy.

Kevin F Lee1, Adeline Bonvalet, Patrick Nuernberger

  • 1Laboratoire d'Optique et Biosciences, Ecole Polytechnique Centre National de Recherche Scientifique, 91128 Palaiseau, France.

Optics Express
|August 6, 2009
PubMed
Summary
This summary is machine-generated.

We developed a novel method to track interferometer path differences with nanometer accuracy. This technique uses a helium-neon beam to determine motion direction and continuously track path delay without extra optics.

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Area of Science:

  • * Interferometry
  • * Optical spectroscopy
  • * Precision measurement

Background:

  • * Interferometers are crucial for precise measurements but often require additional optics to track path differences.
  • * Existing methods can determine motion but lack directional information.

Purpose of the Study:

  • * To develop a method for tracking path differences in interferometer arms with nanometer accuracy.
  • * To enable directional tracking of motion within an interferometer setup.
  • * To continuously monitor path delay without introducing new optical components.

Main Methods:

  • * Co-propagation of a helium-neon beam with mid-infrared pulses through interferometer arms.
  • * Monitoring interference patterns of the helium-neon beam.
  • * Oscillating one arm's path length using a piezoelectric stack mirror.
  • * Analyzing oscillations to calculate direction and track path delay.

Main Results:

  • * Achieved few-nanometer accuracy in tracking path differences.
  • * Successfully determined the direction of motion.
  • * Demonstrated continuous tracking of path delay.
  • * Validated the method without adding extra optics to the beam path.

Conclusions:

  • * The described method provides accurate, directional path difference tracking in interferometers.
  • * This technique enhances multidimensional spectroscopy by enabling precise motion analysis.
  • * It offers a non-intrusive approach to monitor dynamic changes in optical setups.