High Spectral Resolution Time‐resolved Optical Spectroscopy of V893 Scorpii

2001 ◽  
Vol 563 (1) ◽  
pp. 351-360 ◽  
Author(s):  
E. Mason ◽  
W. Skidmore ◽  
S. B. Howell ◽  
R. E. Mennickent
Keyword(s):  
Optical Spectroscopy ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Resolution Time ◽  
Time Resolved

scholarly journals Time-resolved mid-infrared dual-comb spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad A. Abbas ◽  
Qing Pan ◽  
Julien Mandon ◽  
Simona M. Cristescu ◽  
Frans J. M. Harren ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Vibrational Excitation ◽  
High Spectral Resolution ◽  
Acquisition Time ◽  
Time Resolved ◽  
Short Acquisition Time ◽  
Mid Infrared ◽  
Infrared Wavelength ◽  
Potential Applications ◽  
Kinetics Of

AbstractDual-comb spectroscopy can provide broad spectral bandwidth and high spectral resolution in a short acquisition time, enabling time-resolved measurements. Specifically, spectroscopy in the mid-infrared wavelength range is of particular interest, since most of the molecules have their strongest rotational-vibrational transitions in this “fingerprint” region. Here we report time-resolved mid-infrared dual-comb spectroscopy, covering ~300 nm bandwidth around 3.3 μm with 6 GHz spectral resolution and 20 μs temporal resolution. As a demonstration, we study a CH4/He gas mixture in an electric discharge, while the discharge is modulated between dark and glow regimes. We simultaneously monitor the production of C2H6 and the vibrational excitation of CH4 molecules, observing the dynamics of both processes. This approach to broadband, high-resolution, and time-resolved mid-infrared spectroscopy provides a new tool for monitoring the kinetics of fast chemical reactions, with potential applications in various fields such as physical chemistry and plasma/combustion analysis.

scholarly journals Characterization of Metabolic Differences between Benign and Malignant Tumors: High-Spectral-Resolution Diffuse Optical Spectroscopy

Radiology ◽  
2010 ◽  
Vol 254 (1) ◽  
pp. 277-284 ◽  
Author(s):  
Shwayta Kukreti ◽  
Albert E. Cerussi ◽  
Wendy Tanamai ◽  
David Hsiang ◽  
Bruce J. Tromberg ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
Spectral Resolution ◽  
Malignant Tumors ◽  
High Spectral Resolution ◽  
Diffuse Optical Spectroscopy

scholarly journals Lidar Innovations for Technologies and Environmental Sciences (LITES) – An Remote Sensing Infrastructure Facility: Setup and Measurements Examples

2020 ◽  
Vol 237 ◽  
pp. 07017
Author(s):  
Boyan Tatarov ◽  
Detlef Müller ◽  
Matthias Tesche ◽  
Sung-Kyun Shin
Keyword(s):  
Remote Sensing ◽  
Spectral Resolution ◽  
High Energy ◽  
High Spectral Resolution ◽  
Ultra High Energy ◽  
Lidar Signal ◽  
Environmental Sciences ◽  
Time Resolved ◽  
The University

At the University of Hertfordshire, we have been developing a new remote sensing facility (LITES) to explore the feasibility of using Raman and/or fluorescence backscattering for chemical aerosol profiling. This paper provides an overview of the instruments of the facility and measurement examples. LITES includes a ultra-high-energy Nd:YAG/OPO setup, spectroscopic equipment with high spectral resolution, several imaging and single detectors that allow for time-resolved (lidar) signal detection, a Raman/fluorescence microscope, and a suite of gas and aerosol chambers. We present examples of elastic, rotational and vibrational spectroscopic lidar signals, as well as in-situ microscopic spectrums of dust and bio-aerosol compounds.

scholarly journals Improved spectral resolution of the femtosecond stimulated Raman spectroscopy achieved by the use of the 2nd-order diffraction method

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dong-gu Kang ◽  
Kyung Chul Woo ◽  
Do Hyung Kang ◽  
Chanho Park ◽  
Sang Kyu Kim
Keyword(s):  
Raman Spectroscopy ◽  
Spectral Resolution ◽  
Diffraction Method ◽  
High Spectral Resolution ◽  
Double Pass ◽  
Time Resolved ◽  
Order Diffraction ◽  
Pump Laser Pulse ◽  
Raman Pump ◽  
Stimulated Raman

AbstractProlongation of the picosecond Raman pump laser pulse in the femtosecond stimulated Raman spectroscopy (FSRS) setup is essential for achieving the high spectral resolution of the time-resolved vibrational Raman spectra. In this work, the 2nd-order diffraction has been firstly employed in the double-pass grating filter technique for realizing the FSRS setup with the sub-5 cm−1 spectral resolution. It has been experimentally demonstrated that our new FSRS setup gives rise to a highly-resolved Raman spectrum of the excited trans-stilbene, which is much improved from those reported in the literatures. The spectral resolution of the present FSRS system has been estimated to be the lowest value ever reported to date, giving Δν = 2.5 cm−1.

Nanosecond Time-Resolved Step-Scan FT-IR Spectroscopy in Conventional and Supercritical Fluids Using a Four-Window Infrared Cell

2002 ◽  
Vol 56 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Xue Z. Sun ◽  
Sergei M. Nikiforov ◽  
Jixin Yang ◽  
Christopher S. Colley ◽  
Michael W. George
Keyword(s):  
Supercritical Fluids ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Fast Time ◽  
Transient Time ◽  
Kinetic Measurements ◽  
Time Resolved ◽  
Significant Difference ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Fast time-resolved step-scan FT-IR (s2–FT-IR) has been used to study excited states and reaction intermediates in conventional and supercritical solvents. We have developed a four-port IR cell for s2–FT-IR measurements. The generation of W(CO)5(Xe), following photolysis of W(CO)6 in supercritical Xe, has been used to optimize our s2–FT-IR measurements in supercritical fluids using the four-port IR cell. We have compared a number of different approaches for obtaining transient time-resolved IR (TR-IR) data. The IR diode-laser-based and s2–FT-IR approaches for TR-IR have been compared directly. The kinetic decay of the CpMo(CO)3 (Cp = η5–C5H5) radical in supercritical CO2 has been determined using both TR-IR approaches, and we find no significant difference in signal-to-noise between these techniques for most of our TR-IR kinetic measurements. We have attempted to compare s2–FT-IR to the scanning dispersive TR-IR method by obtaining the infrared spectrum of the triplet excited state of 4-phenylbenzophenone, which has been published previously. The importance of obtaining high spectral resolution s2–FT-IR spectra for reactions in condensed phases is investigated. The IR spectrum of the CpFe(CO)2 radical in n-heptane shows that important information regarding the structure of the radical can only be obtained by performing time-resolved s2–FT-IR experiments at high spectral resolution.

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