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Related Concept Videos

IR Frequency Region: X–H Stretching01:24

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 the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
Redox Titration: Iodimetry and Iodometry01:23

Redox Titration: Iodimetry and Iodometry

Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...

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Related Experiment Video

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Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation
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Published on: January 6, 2016

High-performance iodine fiber frequency standard.

Anna Lurie1, Fred N Baynes, James D Anstie

  • 1Frequency Standards and Metrology Group, School of Physics, The University of Western Australia, Perth, Western Australia. anna@physics.uwa.edu.au

Optics Letters
|December 20, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a compact optical frequency standard using iodine vapor in hollow-core photonic crystal fiber (HC-PCF). This new standard achieves excellent frequency stability, surpassing previous gas-filled HC-PCF systems.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Metrology and Measurement Science
  • Laser Spectroscopy

Background:

  • Optical frequency standards are crucial for precise timekeeping and scientific measurements.
  • Hollow-core photonic crystal fibers (HC-PCFs) offer a unique medium for gas-based frequency standards.
  • Previous gas-filled HC-PCF systems faced limitations in achieving high frequency stability.

Purpose of the Study:

  • To construct a compact and robust optical frequency standard.
  • To utilize iodine vapor within an HC-PCF for laser frequency stabilization.
  • To investigate the performance and limitations of such a system.

Main Methods:

  • A 532 nm laser was frequency locked to a specific hyperfine component of the R(56) 32-0 (127)I(2) transition.
  • Modulation transfer spectroscopy was employed for the frequency locking mechanism.
  • Iodine vapor was loaded into the core of a hollow-core photonic crystal fiber (HC-PCF).

Main Results:

  • The stabilized laser achieved a frequency stability of 2.3×10(-12) at 1 second.
  • This performance represents an order of magnitude improvement over previous gas-filled HC-PCF systems.
  • The current frequency stability limit is determined by the shot noise in the detection system.

Conclusions:

  • A compact and robust optical frequency standard based on iodine in HC-PCF has been successfully constructed.
  • The system demonstrates significantly enhanced frequency stability compared to prior gas-filled HC-PCF standards.
  • Future improvements exceeding an order of magnitude are feasible by addressing current performance limitations.