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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

639
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
639
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

1.0K
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....
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

2.1K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
2.1K
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

2.3K
The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

2.3K
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...
2.3K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.9K
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...
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Updated: Apr 13, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Broadband comb spectroscopy through spectral envelope shaping.

Ina Heckelmann1, Davide Pinto2, Uwe Schmitt3

  • 1Institute of Quantum Electronics, Department of Physics, ETH Zürich, Zürich, Switzerland. iheckelmann@ethz.ch.

Nature Communications
|April 11, 2026
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Summary
This summary is machine-generated.

A novel single Quantum Cascade Laser (QCL) comb spectroscopy technique enables rapid, compact chemical analysis without moving parts. This method offers high speed and dynamic range for real-time monitoring of organic solvent vapors.

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Area of Science:

  • Spectroscopy
  • Laser Technology
  • Chemical Analysis

Background:

  • Optical frequency combs enable broad spectral bandwidth for chemical analysis.
  • Existing dual-comb spectrometers are complex due to the need for matched, coherent combs.
  • A need exists for simpler, more compact, and faster spectroscopy techniques.

Purpose of the Study:

  • To propose and implement a rapid, compact, broadband spectroscopy technique.
  • To leverage a single Quantum Cascade Laser (QCL) comb for spectroscopy.
  • To enable non-interferometric chemical analysis of organic solvent vapors.

Main Methods:

  • Utilized a single Quantum Cascade Laser (QCL) comb emitting in the mid-infrared molecular fingerprint region.
  • Developed a non-interferometric spectroscopy setup.
  • Employed a system without moving components for enhanced speed and simplicity.

Main Results:

  • Achieved a time resolution as low as 10 microseconds.
  • Demonstrated a high dynamic range spanning three orders of magnitude in concentration.
  • Successfully performed targeted and non-targeted analysis of various organic solvent vapors.

Conclusions:

  • The single QCL comb spectroscopy technique is rapid, compact, and broadband.
  • The non-interferometric approach simplifies system design.
  • This method is suitable for real-time chemical kinetics analysis.