The formation of HCO and of H in the photolysis of glyoxal have been investigated over the wavelength ranges 310-335 nm for HCO and 193-340 nm for H. Dye laser photolysis was coupled with cavity ring-down spectroscopy for HCO, and with laser induced fluorescence spectroscopy for H. Absolute quantum yields were determined using actinometers based on (a) Cl2 photolysis and the Cl + HCHO reaction for HCO and (b) N2O photolysis (and O(1)D + H2) and CH2CO photolysis (and CH2 + O2) for H. The quantum yields were found to be pressure independent in this wavelength region. Quantum yields for all product channels under atmospheric conditions were calculated and compared with literature values. Differences between this work and previously published work and their atmospheric implications are discussed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c3cp43597k | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Modeling predicts facile release of nitrite but not nitric oxide from the thionitrate CHSNO with relevance to nitroglycerin bioactivation.
Sci Rep
December 2024
Department of Chemistry and Biochemistry, Centre for Research in Molecular Modeling (CERMM), Concordia University, 7141 Sherbrooke Street West, Montréal, QC, H4B 1R6, Canada.
Nitroglycerin is a potent vasodilator in clinical use since the late 1800s. It functions as a prodrug that is bioactivated by formation of an enzyme-based thionitrate, E-Cys-NO. This intermediate reportedly decomposes to release NO and NO but their relative yields remain controversial.
View Article and Find Full Text PDFCholesky Decomposition and the Second-Derivative Two-Electron Integrals Required for the Computation of Magnetizabilities Using Gauge-Including Atomic Orbitals.
J Phys Chem A
December 2024
Department Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
The computation of magnetizability tensors using gauge-including atomic orbitals is discussed in the context of Cholesky decomposition (CD) for the two-electron repulsion integrals with a focus on the involved doubly differentiated integrals. Three schemes for their handling are suggested: the first exploits the density fitting (DF) aspect of Cholesky decomposition, the second uses expressions obtained by differentiating the CD expression for the unperturbed two-electron integrals, while the third addresses the issue that the first two schemes are not able to represent the doubly differentiated integrals with arbitrary accuracy. This scheme uses a separate Cholesky decomposition for the cross terms in the doubly differentiated two-electron integrals.
View Article and Find Full Text PDFEnabling Aqueous Phase Long-lived Deep-blue Phosphorescence With Layered Double Hydroxide.
Adv Sci (Weinh)
December 2024
Analytical & Testing Center, Chengdu, 610064, China.
Aqueous-phase phosphors are of utmost importance for a myriad of applications. However, the emission wavelengths of the current aqueous organic room-temperature phosphorescent (RTP) materials are limited to green and red bands, while the blue part is rarely reported, thus limiting the development of a full-color RTP system. Theoretically, carboxylated benzene is expected to be blue phosphorescence-emissive, but only green phosphorescence is observed in solid, due to the strong intermolecular π-π stacking that decreases the energy gap.
View Article and Find Full Text PDFUltrasensitive analysis of the commonly abused CNS antitussive, dextromethorphan in biological fluids and dosage forms using a novel micellar-sensitized spectrofluorimetric approach: Compliance with greenness and blueness metrics.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Kafrelsheikh University, Kafrelsheikh 33511, Egypt. Electronic address:
The current study introduces the first micellar-enhanced spectrofluorimetric approach for the estimation of the commonly abused CNS antitussive, dextromethorphan (DXM) in its syrup and biological fluids. A micellar solution of sodium dodecyl sulfate (SDS) containing DXM showed high native fluorescence emission at 305 nm following excitation at 224 nm. Using SDS as a micellar system resulted in about a 2.
View Article and Find Full Text PDFRapid and Large-Scale Synthesis of Chiral and Fluorescent Sulfur Quantum Dots for Intracellular Temperature Monitoring.
Chem Biomed Imaging
December 2024
College of Chemistry and Materials Science, Jinan University, Guangzhou, Guangdong 510632, China.
The large-scale preparation of fluorescent nanomaterials with laboratory-relevant chemical and optical properties will greatly forward their consumer market applications; however, it still remains challenging. In this work, a universal strategy was developed for the rapid and large-scale synthesis of fluorescent sulfur quantum dots that recently has drawn great attention because of their unique optical characteristics. From the fact that empty 3d orbitals of sulfide species are able to bind with lone-pair π electrons of the heteroatomic groups, many amino-group containing compounds, such as amino acid and polyethylenimine molecules, were exploited to synthesize sulfur quantum dots.
View Article and Find Full Text PDFWant 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!