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Related Concept Videos

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...
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...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and 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 Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...

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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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Overtone mobility spectrometry: part 1. Experimental observations.

Ruwan T Kurulugama1, Fabiane M Nachtigall, Sunyoung Lee

  • 1Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA.

Journal of the American Society for Mass Spectrometry
|February 7, 2009
PubMed
Summary
This summary is machine-generated.

A new continuous ion mobility filter uses modulated drift fields instead of traditional gates. This method allows for tunable separation of ions from continuous sources, enhancing resolution for complex mixtures.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Conventional ion mobility instruments rely on electrostatic gates for ion packet introduction.
  • Continuous ion sources present challenges for traditional ion mobility analysis.

Purpose of the Study:

  • To develop a novel linear drift tube method for continuous ion mobility filtering.
  • To enable tunable ion separation from continuous ion sources.

Main Methods:

  • Utilized multiple segmented drift regions with modulated drift fields.
  • Applied varying drift field frequencies to selectively transmit ions based on mobility.
  • Analyzed ion transmission peaks and overtones to determine resolving power.

Main Results:

  • Demonstrated a linear drift tube functioning as a continuous ion mobility filter.
  • Showcased tunable ion transmission by adjusting drift field frequencies.
  • Observed increased resolving power at higher harmonic frequencies, resolving previously unseparated structures.
  • Successfully analyzed oligosaccharide isomers and peptide mixtures.

Conclusions:

  • The modulated drift field approach offers a new paradigm for continuous ion mobility filtering.
  • This method provides enhanced resolution and tunability for analyzing complex ion samples.
  • The technique is effective for separating isomeric compounds and complex peptide digests.