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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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 Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

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 hydrogen bonding...
Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature from...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Wavelength effect on atomic and molecular high harmonic generation driven by a tunable infrared parametric source.

Pengfei Wei1, Chunmei Zhang, Candong Liu

  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.

Optics Express
|August 19, 2009
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Summary

High-order harmonic generation (HHG) in molecules is sensitive to driver wavelength, unlike atomic HHG. Tuning infrared laser wavelength controls molecular proton vibration.

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Area of Science:

  • Quantum Optics
  • Molecular Physics
  • Nonlinear Optics

Background:

  • High-order harmonic generation (HHG) is a crucial nonlinear optical process.
  • Understanding wavelength-dependent HHG is key for controlling light-matter interactions.
  • Molecular HHG exhibits unique characteristics due to nuclear motion.

Purpose of the Study:

  • To experimentally investigate the effect of driver wavelength on HHG in methane (CH4) molecules and xenon (Xe) atoms.
  • To compare the wavelength sensitivity of molecular HHG with atomic HHG.
  • To explore the possibility of controlling molecular vibrations via laser wavelength tuning.

Main Methods:

  • Utilizing a tunable infrared parametric source to drive HHG.
  • Experimentally measuring HHG spectra from CH4 molecules and Xe atoms.
  • Comparing HHG yields and spectral features at different infrared wavelengths.

Main Results:

  • Molecular HHG around vibrational resonance shows higher sensitivity to driver wavelength compared to atomic HHG.
  • Atomic gas (Xe) with similar ionization potential exhibits less wavelength-dependent HHG.
  • The observed sensitivity is linked to laser-induced light nuclear motion in molecules.

Conclusions:

  • The driver laser wavelength can be tuned to control proton vibration in molecular HHG.
  • Molecular HHG offers a pathway for laser control over vibrational dynamics.
  • This finding opens new avenues for attosecond science and molecular control.