AI Article Synopsis
Article Abstract
We have investigated 4-μm-band SO absorption lines for in situSO detection using a mid-infrared laser source based on difference frequency generation in a quasi-phase-matched LiNbO waveguide. In the wavelength range of 4.09400-4.10600 μm, there were strong SO absorption lines. The maximum absorption coefficient at a concentration of 170 ppmv was estimated to be about 3.2×10 cm at a gas temperature of 190°C. In coexistence with HO, the reduction of the SO absorption peak height was observed, which was caused by sulfuric acid formation. We discuss a method of using an SO equilibrium curve to derive the total SO molecule concentration.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/AO.55.006887 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Laser Flash Photolysis of Carbazole in Solution: Cation Radical as a Source of Carbazolyl Radical.
J Phys Chem B
January 2025
Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland.
In the course of 266 nm nanosecond laser flash photolysis of carbazole (CBL) in acetonitrile, we discovered a new transient absorption band centered at 360 nm that has been heretofore unreported despite numerous reports on similar topics. To put some limits on possible transients responsible for this absorption band and thus to solve the mechanism of CBL photolysis, we employed the strategy of selectively blocking the CBL active sites by various modifications in the structure. This strategy was supported by the use of the solvent effect and triplet quenching by molecular oxygen.
View Article and Find Full Text PDFRevealing the reaction path of UVC bond rupture in cyclic disulfides with ultrafast x-ray scattering.
Sci Adv
January 2025
Department of Chemistry, Brown University, Providence, RI, USA.
Disulfide bonds are ubiquitous molecular motifs that influence the tertiary structure and biological functions of many proteins. Yet, it is well known that the disulfide bond is photolabile when exposed to ultraviolet C (UVC) radiation. The deep-UV-induced S─S bond fragmentation kinetics on very fast timescales are especially pivotal to fully understand the photostability and photodamage repair mechanisms in proteins.
View Article and Find Full Text PDFToxicological problems of tattoo removal: characterization of femtosecond laser-induced fragments of Pigment Green 7 and Green Concentrate tattoo ink.
Arch Toxicol
January 2025
STARTNETICS - Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133, Rome, Italy.
Femtosecond lasers represent a novel tool for tattoo removal as sources that can be operated at high power, potentially leading to different removal pathways and products. Consequently, the potential toxicity of its application also needs to be evaluated. In this framework, we present a comparative study of Ti:Sapphire femtosecond laser irradiation, as a function of laser power and exposure time, on water dispersions of Pigment Green 7 (PG7) and the green tattoo ink Green Concentrate (GC), which contains PG7 as its coloring agent.
View Article and Find Full Text PDFMultiple optical path length reflections enhancement based on balloon-type photoacoustic cell for trace gas sensing.
Photoacoustics
February 2025
College of Engineering, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
A novel balloon-type photoacoustic cell (BTPAC) is proposed to facilitate the detection limitations of acetylene (CH) gas achieving ppb level. Here, an ellipsoidal photoacoustic cavity is employed as the platform for gas-light interaction. By strategically directing the excitation source towards the focal point of the ellipsoidal cavity, ensuring its trajectory traverses the focal point upon each reflection from the interior walls.
View Article and Find Full Text PDFDynamic X-ray Microtomography vs. Laser-Doppler Vibrometry: A Comparative Study.
J Assoc Res Otolaryngol
January 2025
Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, 3010, Freiburgstrasse, Bern, Switzerland.
Purpose: There are challenges in understanding the biomechanics of the human middle ear, and established methods for studying this system show significant limitations. In this study, we evaluate a novel dynamic imaging technique based on synchrotron X-ray microtomography designed to assess the biomechanical properties of the human middle ear by comparing it to laser-Doppler vibrometry (LDV).
Methods: We examined three fresh-frozen temporal bones (TB), two donated by white males and one by a Black female, using dynamic synchrotron-based X-ray microtomography for 256 and 512 Hz, stimulated at 110 dB and 120 dB sound pressure level (SPL).
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!