Lithium Hydrides and Lithium Dimers: Sub-Doppler Spectroscopy and Dynamics

2002 ◽  
Vol 49 (4) ◽  
pp. 467-478
Author(s):  
N. Bouloufa ◽  
P. Cacciani ◽  
G.-H. Jeung ◽  
R. Vetter
Keyword(s):  
Doppler Spectroscopy ◽  
Lithium Dimers

scholarly journals Measuring planetary atmospheric dynamics with Doppler spectroscopy

2018 ◽  
Vol 617 ◽  
pp. A41 ◽  
Author(s):  
Patrick Gaulme ◽  
François-Xavier Schmider ◽  
Ivan Gonçalves
Keyword(s):  
Radial Velocity ◽  
Solar Rotation ◽  
Imaging Spectroscopy ◽  
Planetary Atmospheres ◽  
Atmospheric Dynamics ◽  
Doppler Imaging ◽  
Significant Difference ◽  
Doppler Spectroscopy ◽  
The Impact ◽  
Cloud Tracking

Doppler imaging spectroscopy is the most reliable method of directly measuring wind speeds of planetary atmospheres of the solar system. However, most knowledge about atmospheric dynamics has been obtained with cloud-tracking technique, which consists of tracking visible features from images taken at different dates. Doppler imaging is as challenging (motions can be less than 100 m s−1) as it is appealing because it measures the speed of cloud particles instead of large cloud structures. A significant difference between wind speed measured by cloud-tracking and Doppler spectroscopy is expected in case of atmospheric waves interfering with cloud structures. The purpose of this paper is to provide a theoretical basis for conducting accurate Doppler measurements of planetary atmospheres, especially from the ground with reflected solar absorption lines. We focus on three aspects which lead to significant biases. Firstly, we fully review the Young effect, which is an artificial radial velocity field caused by the solar rotation that mimics a retrograde planetary rotation. Secondly, we extensively study the impact of atmospheric seeing and show that it modifies the apparent location of the planet in the sky whenever the planet is not observed at full phase (opposition). Moreover, the seeing convolves regions of variable radial velocity and photometry, which biases radial-velocity measurements, by reducing the apparent amplitude of atmospheric motions. Finally, we propose a method to interpret the data: how to retrieve zonal, meridional, vertical, and subsolar-to-antisolar circulation from radial velocity maps, by optimizing the signal-to-noise ratio.

scholarly journals Development of the method of laser Doppler spectroscopy of nanoparticles in liquids and implementation of the method in the LAD-079 spectrometer

2021 ◽  
Vol 2057 (1) ◽  
pp. 012094
Author(s):  
V G Meledin ◽  
S V Dvoinishnikov ◽  
I K Kabardin ◽  
A S Chubov ◽  
G V Bakakin ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Software Implementation ◽  
Optical Studies ◽  
Distinctive Features ◽  
Optical Table ◽  
Doppler Spectroscopy ◽  
532 Nm ◽  
Precision Thermostat ◽  
Parallel Measurements

Abstract In this work, a method for physicochemical and biological optical studies of the nanoparticles size distribution is developed. Its implementation in the LAD-079 spectrometer is described. The distinctive features of the LAD-079 spectrometer include the following. Multi-angle parallel measurements of static and dynamic light scattering, scattering angle from 0–180 degrees. Probing at three wavelengths with the ability to analyze the polarization activity of the sample (488 nm, 532 nm, 650 nm). Programmable precision thermostat with an error less than 0.1 °C in the range 0 ÷ +80°C with the possibility of building and software implementation of the experiment plan. Robust monobloc design of the spectrometer that does not require adjustments and a special optical table. The ability to measure the size of dispersed nanoparticles in low-transparent liquids.

Correction to “Sub-Doppler Spectroscopy of the trans-HOCO Radical in the OH Stretching Mode”

2014 ◽  
Vol 118 (23) ◽  
pp. 4233-4233
Author(s):  
Chih-Hsuan Chang ◽  
Grant T. Buckingham ◽  
David J. Nesbitt
Keyword(s):  
Doppler Spectroscopy
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