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IR Frequency Region: X–H Stretching

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of 2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...

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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.
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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...

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Related Experiment Video

Updated: May 3, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Octave-spanning coherent mid-IR generation via adiabatic difference frequency conversion.

Haim Suchowski, Peter R Krogen, Shu-Wei Huang

|February 12, 2014

Summary

This summary is machine-generated.

We achieved efficient downconversion of near-infrared pulses to mid-infrared using a novel chirped quasi-phase-matching grating. This method generates broadband mid-IR light, useful for various laser systems.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Area of Science:

Nonlinear optics
Laser physics
Materials science

Background:

Broadband mid-infrared (mid-IR) light sources are crucial for spectroscopy and sensing.
Existing methods for mid-IR generation often involve complex setups or limited bandwidth.

Purpose of the Study:

To demonstrate efficient downconversion of near-IR pulses to broadband mid-IR pulses.
To utilize a single nonlinear and adiabatic chirped quasi-phase-matching grating for this conversion.

Main Methods:

Employed a magnesium oxide doped lithium niobate crystal with a chirped quasi-phase-matching grating.
Mixed μJ-energy optical parametric chirped pulse amplifier (OPCPA) pulses (680-870 nm) with a narrowband 1047-nm pulse.

Main Results:

Achieved 1.1-octave-spanning mid-IR pulses from 2 to 5 μm (at -10 dB).
Demonstrated near full photon number conversion.
Confirmed robustness for various input OPCPA pulses.

Conclusions:

The demonstrated method offers an efficient and robust way to generate broadband mid-IR pulses.
This technique is suitable for post-amplification conversion, broadening applicability for near-IR laser systems.