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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Highly Sensitive Low-Frequency Time-Domain Raman Spectroscopy via Fluorescence Encoding.

Phillip C McCann1, Kotaro Hiramatsu1,2,3, Keisuke Goda1,4,5

  • 1Department of Chemistry, The University of Tokyo, Tokyo 113-0033, Japan.

The Journal of Physical Chemistry Letters
|August 12, 2021
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We developed a new method, fluorescence-encoded time-domain coherent Raman spectroscopy (FLETCHERS), for highly sensitive low-frequency vibrational spectroscopy. This technique significantly enhances sensitivity, enabling detection of molecules at nanomolar concentrations.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Fluorescence-encoded vibrational spectroscopy offers high chemical specificity and sensitivity.
  • Current methods struggle with sensitivity in the low-frequency spectral region.
  • Addressing this limitation could significantly expand the applications of vibrational spectroscopy.

Purpose of the Study:

  • To develop a novel method for highly sensitive low-frequency fluorescence-encoded vibrational spectroscopy.
  • To overcome the sensitivity limitations of existing techniques in the low-frequency domain.
  • To enable new applications in molecular analysis and characterization.

Main Methods:

  • Introduced fluorescence-encoded time-domain coherent Raman spectroscopy (FLETCHERS).
  • Excited molecules into vibrationally excited states and then promoted them to electronic states at varying times.
  • Encoded molecular vibrations onto time-domain fluorescence intensity.

Main Results:

  • Demonstrated sensitive low-frequency detection of rhodamine 800 solutions down to 250 nM.
  • Achieved approximately 1000-fold improvement in sensitivity compared to conventional vibrational spectroscopy.
  • Successfully measured vibrational spectra in the lower fingerprint region.

Conclusions:

  • FLETCHERS significantly enhances sensitivity for low-frequency vibrational spectroscopy.
  • The method shows promise for analyzing dilute samples and complex molecular systems.
  • Opens prospects for single-molecule vibrational spectroscopy in the low-frequency region.