Time-resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB

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.

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High Spectral Resolution Time‐resolved Optical Spectroscopy of V893 Scorpii

The Astrophysical Journal ◽

10.1086/323431 ◽

2001 ◽

Vol 563 (1) ◽

pp. 351-360 ◽

Cited By ~ 16

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

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

EPJ Web of Conferences ◽

10.1051/epjconf/202023707017 ◽

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.

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

Scientific Reports ◽

10.1038/s41598-021-83090-7 ◽

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.

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Spatially resolved, high-spectral resolution observation of the K giant Aldebaran in the CO first overtone lines with VLTI/AMBER

Astronomy and Astrophysics ◽

10.1051/0004-6361/201321207 ◽

2013 ◽

Vol 553 ◽

pp. A3 ◽

Cited By ~ 14

Author(s):

K. Ohnaka

Keyword(s):

Spectral Resolution ◽

High Spectral Resolution ◽

Spatially Resolved ◽

Resolution Observation

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High Spectral Resolution Observations of Coronal X-Ray Emission from the RS CVn Binary Sigma Corona Borealis

International Astronomical Union Colloquium ◽

10.1017/s0252921100085559 ◽

1984 ◽

Vol 86 ◽

pp. 143-146

Author(s):

G.R. Riegler ◽

P.C. Agrawal ◽

T.H. Markert

Keyword(s):

Spectral Resolution ◽

Emission Measure ◽

High Spectral Resolution ◽

Loop Model ◽

X Ray ◽

Resolution Observation ◽

Volume Emission ◽

Best Fit ◽

Spectral Scan ◽

Prominent Peak

Results of a high spectral resolution observation of the RS CVn binary σ Cr B, made with the Focal Plane Crystal Spectrometer (FPCS) on the Einstein Observatory, are reported. A spectral scan in the 800–840 eV interval shows clear presence of an X-ray emission line at 826 eV identified with the 1S0 − 1P1 transition of Fe XVII. A prominent peak at 1007 eV in the scan band 987–1013 eV is attributed to a blend of lines due to Fe XVII and Fe XXI. Using the observed line fluxes and the Raymond-Smith model, best fit values of corona temperature and volume emission measure, with associated 90% confidence level uncertainties, are derived to be (6.9 ± 0.8) × 106 K and (1.7 ± 0.7) × 1053 cm−3, respectively. Pressure and density of the X-ray emitting plasma and loop length are deduced by applying a Constant Pressure Coronal Loop Model.

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High Spectral Resolution Observation of Decimetric Radio Spikes Emitted by Solar Flares – First Results of the Phoenix-3 Spectrometer

Solar Physics ◽

10.1007/s11207-009-9455-1 ◽

2009 ◽

Vol 260 (2) ◽

pp. 375-388 ◽

Cited By ~ 11

Author(s):

Arnold O. Benz ◽

Christian Monstein ◽

Michael Beverland ◽

Hansueli Meyer ◽

Bruno Stuber

Keyword(s):

Spectral Resolution ◽

Solar Flares ◽

High Spectral Resolution ◽

Resolution Observation ◽

First Results ◽

The Phoenix

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

Applied Spectroscopy ◽

10.1366/0003702021954403 ◽

2002 ◽

Vol 56 (1) ◽

pp. 31-39 ◽

Cited By ~ 16

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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