It is shown that the continuous background of the laser-induced breakdown spectrum of Al produced by 800 nm femtosecond pulses is strongly polarized. Use of a polarizer to filter out the background significantly improves the signal/noise and signal/background ratios of the discrete line spectrum. The effects of the laser pulse energy, focal position, incidence and detection angles, and the pola...

Fulvic acid (FA) is a water-soluble component of natural organic matter whose environmental and organic geochemistry is routinely correlated to its molecular weight. In an attempt to examine the usefulness of laser desorption (LD) mass spectrometry to unambiguously determine this characteristic, laser wavelengths of 10.6 mm, 1.06 mm and 355 nm were evaluated using the four International Humic S...

The development of modern mass spectrometry (MS) equipment with high resolution and mass accuracy has led to its use in analyzing glycans for both profiling and structural studies. Unlike the HPLC method, a substantially larger amount (~10‐20 times) of glycan is normally required for a single MS spectrum. Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry i...

We present the discovery of 2MASS J21321145+1341584AB as a closely separated (0.066) very low-mass field dwarf binary resolved in the near-infrared by the Keck II Telescope using laser guide star adaptive optics. Physical association is deduced from the angular proximity of the components and constraints on their common proper motion. We have obtained a near-infrared spectrum of the binary and ...

Broadband low-coherence light is considered to be an effective way suppress laser plasma instability. Recent studies have demonstrated the ability of facilities reduce back-scattering during beam–target coupling. However, ensure simultaneous low coherence and high energy, complex spectral modulation methods amplification routes adopted. In this work, we propose use a random fiber (RFL) as seed ...

We solved one dimensional Schrodinger equation in a H2+ molecular environment by using 3 femtosecond homogeneous and nonhomogeneous laser fields. In homogeneous case, we found out that larger inter nuclear distances result in earlier ionization and also more instability in the wave packet. We deducted that the more the instability is, the more modulated the power spectrum will be. So, by choosi...

Time resolved laser induced incandescence (LII) technique is used to measure size distribution of soot nanoparticles of candle's flame. Pulsed Nd:YAG laser is used to heat nanoparticles to incandescence temperature and the resulting signal is measured. Mass and energy balance equations are numerically solved to calculate temperature of soot particles in low fluence regime. Assuming Plank black ...