Related Experiment Video
Updated: Jun 28, 2025
08:12
Author Spotlight: Exploring Light-Driven Chemical Reactions and Energy-Harnessing Devices in Photochemical Research
Published on: February 16, 2024
9.2K
Sub-PPB Detection with Gas-Phase Multiphoton Electron Extraction Spectroscopy under Ambient Conditions
Tikhon Filippov1, Elena Vervitski1, Hila Kofler1
1Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Sensors (Basel, Switzerland)
|April 13, 2024
Summary
Multiphoton electron extraction spectroscopy (MEES) now works in the gas phase for highly sensitive trace gas detection. This new gas-phase MEES technique achieves sub-part per billion sensitivity for environmental and industrial monitoring.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Environmental Science
Background:
- Multiphoton electron extraction spectroscopy (MEES) is established for surface analysis.
- Existing methods for trace gas detection often lack sensitivity or require specific conditions.
Purpose of the Study:
- Introduce and validate the first application of MEES in the gas phase (gas-phase MEES).
- Enable quantitative detection of trace gases at sub-part per billion (sub-PPB) concentrations in ambient air.
Main Methods:
- Utilized resonant multiphoton ionization with nanosecond laser pulses and high electrical fields.
- Recorded photoelectron charges as a function of laser wavelength for spectral analysis.
- Achieved high spectral resolution with peak widths < 0.02 nm FWHM.
Main Results:
- Demonstrated high sensitivity and spectral resolution of gas-phase MEES.
- Quantitatively analyzed benzene and aniline, showing linear responses in sub-PPM and sub-PPB ranges.
- Confirmed the technique's effectiveness for trace gas detection in ambient conditions.
Conclusions:
- Gas-phase MEES offers enhanced sensitivity and resolution for trace gas analysis.
- The technique shows significant advantages over traditional optical spectroscopic methods.
- Potential applications include environmental monitoring, industrial safety, security, and medical diagnostics.
Keywords:
breathomicselectronic nose (e-nose)environmental monitoringexplosives detectiongas trace detectiongas-phase MEESmultiphoton electron extraction spectroscopysecurity screeningtrace gas analysisMore Related Videos
Related Concept Videos
01:19Gas Chromatography: Types of Detectors-II
368
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
368
01:29Atomic Emission Spectroscopy: Lab
161
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...
161
01:22Atomic Emission Spectroscopy: Instrumentation
379
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
379
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
215
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).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
215
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
01:20Atomic Emission Spectroscopy: Overview
2.1K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.1K