Related Experiment Video
Updated: May 12, 2026
09:57
Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Fast spectrometer for ground-based observations of OH rotational temperature
Hidehiko Suzuki1, Makoto Taguchi, Yoshikazu Kanai
1National Institute of Polar Research, Tokyo, Japan. hsuzuki@nipr.ac.jp
Applied Optics
|April 10, 2013
Summary
A new spectrometer accurately measures hydroxyl airglow temperature in polar regions. This instrument is crucial for understanding atmospheric dynamics and auroral events.
Area of Science:
- Atmospheric physics and chemistry
- Geophysics and space physics
Background:
- The hydroxyl (OH) airglow is a key indicator of atmospheric conditions in the upper atmosphere.
- Observing OH airglow in polar regions is challenging due to auroral contamination.
Purpose of the Study:
- To develop and present a sensitive spectrometer for observing the Meinel OH 8-4 band in polar regions.
- To accurately measure OH rotational temperature and intensity, minimizing auroral interference.
Main Methods:
- Development of a spectrometer with a fast optical system, transmission plane grating, and cooled CCD sensor.
- Acquisition of spectra in the 900-987 nm range, specifically targeting the Meinel OH 8-4 band.
- Derivation of OH rotational temperature with high accuracy (± 1.9 to 2.5 K) from 1-minute exposures.
Main Results:
- The developed spectrometer successfully acquired spectra of the Meinel OH 8-4 band.
- Initial measurements at Syowa Station, Antarctica, provided OH rotational temperature and intensity data.
- The instrument demonstrated effectiveness in obtaining clean spectra, free from significant auroral contamination.
Conclusions:
- The new spectrometer is a valuable tool for polar atmospheric research.
- Accurate OH rotational temperature measurements can be obtained even in the presence of potential auroral activity.
- This instrument facilitates improved understanding of upper atmospheric processes in the polar regions.
More Related Videos
08:22Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
09:40Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
Related Concept Videos
01:27Atomic 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...
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...
01:25IR Spectrometers
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
01:24IR 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...
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...
01:22Atomic Emission Spectroscopy: Instrumentation
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.
01:26Raman Spectroscopy Instrumentation: Overview
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
01:22Atomic Absorption Spectroscopy: Instrumentation
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...