Surface-enhanced Raman scattering (SERS) substrates with high activity and stability are desirable for SERS sensing. Here, we report a new single atomic layer graphitic-C3N4 (S-g-C3N4) and Ag nanoparticles (NPs) hybrid as high-performance SERS substrates. The SERS mechanism of the highly stable S-g-C3N4/Ag substrates was systematically investigated by a combination of experiments and theoretica...

The mineral contents of Centaura leave and seeds were determined by Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES). Macro element concentrations (P, K, Ca, Mg and S) of samples were found at high levels. K was established at high level in both leave and seed samples of Centaurea. While K contents of leaves changes between 7254.10 mg/kg (Centaurea lycaonica) and 26396.36 m...

Fluorescence following optical excitation of the state of prepared on helium 1 3&u` 2 nanodroplets to the predissociative state yields molecular emission from both the 1 3%g and states as well as atomic emission from the expected (B)1 1%u (A)1 1&u` 2 dissociation channel. A D12 cm~1 red shift is observed in the 4 2P3@2, 1@2 4 2S1@2 molecular emission excitation spectrum compared to the atomic e...

External-cavity diode lasers are ubiquitous in atomic physics and a wide variety of other scientific disciplines, due to their excellent affordability, coherence length, versatility. However, for higher-power applications, the combination seed lasers, injection-locking amplifiers can rapidly become expensive complex. Here we present high-power, single-diode laser design with specifications: <mm...