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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...
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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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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Measuring Electronic Transitions Using Leak-Out Spectroscopy.

Samuel J P Marlton1, Philipp C Schmid1, Thomas Salomon1

  • 1I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Cologne, Germany.

The Journal of Physical Chemistry Letters
|August 19, 2025
PubMed
Summary
This summary is machine-generated.

Leak-out spectroscopy (LOS) measures electronic transitions in ions. This single-photon method is ideal for detecting photostable interstellar molecules, potentially aiding the search for diffuse interstellar bands.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Astrochemistry

Background:

  • Electronic spectra of gas-phase ions are crucial for understanding molecular properties.
  • Interstellar molecules, particularly those responsible for diffuse interstellar bands, remain largely uncharacterized.
  • Photostability is a key characteristic for identifying molecules in interstellar environments.

Purpose of the Study:

  • To demonstrate the utility of leak-out spectroscopy (LOS) for measuring electronic transitions in the visible and infrared ranges.
  • To assess the potential of LOS as a general single-photon method for gas-phase electronic spectroscopy of mass-selected ions.
  • To evaluate LOS as a tool for identifying photostable ions relevant to astrochemistry, specifically for the search for diffuse interstellar bands.

Main Methods:

  • Utilized leak-out spectroscopy (LOS) to record electronic spectra.
  • Measured spectra for nitrogen, diacetylene, and triacetylene cations.
  • Employed a single-photon detection approach for mass-selected bare ions.

Main Results:

  • Successfully demonstrated LOS for measuring electronic transitions in the visible and infrared spectra.
  • Obtained electronic spectra for nitrogen, diacetylene, and triacetylene cations.
  • Confirmed LOS as a viable single-photon technique for gas-phase ion spectroscopy.

Conclusions:

  • Leak-out spectroscopy (LOS) is a versatile method for electronic spectroscopy of gas-phase ions.
  • The technique's ability to detect photostable ions makes it highly promising for astrochemistry.
  • LOS may significantly advance the search for diffuse interstellar bands by enabling the identification of key interstellar molecules.