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Related Concept Videos

Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

8.2K
Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
8.2K
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

2.7K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
2.7K
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

2.3K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
2.3K
Mass Spectrometers01:16

Mass Spectrometers

8.2K
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
8.2K
Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

2.1K
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
2.1K
High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

2.3K
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
2.3K

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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Coherent two-dimensional electronic mass spectrometry.

Sebastian Roeding1, Tobias Brixner2

  • 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.

Nature Communications
|June 30, 2018
PubMed
Summary
This summary is machine-generated.

Coherent 2D electronic mass spectrometry enables studying quantum systems with minimal environmental interaction. This technique identifies ionization pathways and analyzes multiphoton ionization in isolated molecules.

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Area of Science:

  • Quantum dynamics
  • Molecular spectroscopy
  • Physical chemistry

Background:

  • Coherent two-dimensional (2D) optical spectroscopy is vital for probing ultrafast dynamics and couplings in quantum systems.
  • Understanding system-environment interactions is crucial for quantum system dynamics and function.
  • Studying coherent interactions in diverse environments is a key research area.

Purpose of the Study:

  • Introduce a novel technique: coherent 2D electronic mass spectrometry.
  • Apply this method to investigate quantum systems with minimal system-bath interaction.
  • Identify ionization pathways and analyze nonlinear responses in molecular systems.

Main Methods:

  • Perform 2D spectroscopic measurements on effusive molecular beams.
  • Utilize time-of-flight detection to observe cations.
  • Achieve spectrally resolved transient-absorption measurement equivalents.

Main Results:

  • Successfully identified the primary ionization pathway for 3d Rydberg states in NO2.
  • Presented 2D spectra of multiphoton ionization, revealing distinct nonlinear response functions.
  • Demonstrated the capability to study isolated systems of photophysical and photochemical reactions.

Conclusions:

  • Coherent 2D electronic mass spectrometry offers a powerful tool for studying isolated quantum systems.
  • The technique provides new insights into molecular ionization processes and dynamics.
  • Enables 2D spectroscopic studies on photophysical and photochemical reactions in isolated environments.