Self-absorption characteristics of measured laser-induced plasma line shapes

Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma

“…The experimental arrangement consists of a set of components typical for time-resolved, laser-induced optical emission spectroscopy [14,15], or nanosecond laser-induced breakdown spectroscopy (LIBS). Primary instrumentations include a Q-switched Nd:YAG device (Quantel model Q-smart 850) that is operated at the fundamental wavelength of 1064-nm to produce full-width-at-half-maximum 6-ns laser radiation with an energy of 850 mJ per pulse, a laboratory type Czerny-Turner spectrometer (Jobin Yvon model HR 640) with a 0.64-m focal length and equipped with a 1200 grooves/mm grating, an intensified charge coupled device (Andor Technology model iStar DH334T-25U-03) for recording of temporally and spatially resolved spectral data, a laboratory chamber or cell with inlet and outlet ports together with a vacuum system, electronic components for synchronization, and various optical elements for beam shaping, steering, and focusing.…”

“…Chemical equilibrium mole fractions of CN are computed for air and the CO 2 :N 2 gas mixture. Measurements utilize a 0.64-m Czerny-Turner type spectrometer and an intensified charge-coupled device.Atoms 2019, 7, 74 2 of 9 adequate for the detection of cyanide, yet molecular emission spectroscopy allows one to measure the composition with a minimally invasive approach.In this study, we report selected results from experiments using nanosecond laser spectroscopy of hydrogen plasma [15] and of CN molecular emission spectroscopy [16]. The CN recombination radiation occurs within the first 100 nanoseconds for laser-induced breakdown in 1:1 mole ratio CO 2 :N 2 gas mixtures at a pressure of 1 atm.…”

“…In this study, we report selected results from experiments using nanosecond laser spectroscopy of hydrogen plasma [15] and of CN molecular emission spectroscopy [16]. The CN recombination radiation occurs within the first 100 nanoseconds for laser-induced breakdown in 1:1 mole ratio CO 2 :N 2 gas mixtures at a pressure of 1 atm.…”

Self-Absorption Analysis of Silver Resonance Lines in Nano-Material Laser Produced Plasma

“…The transmittance, T(τ λ 0 ), is related to the escape factor of the plasma 10,11 , and it depends on the optical thickness of the plasma, τ λ 0 . The transmittance 2,3 , …”

“…For instance, line-ofsight measurements of laser-induced plasma at or near an ice surface 1 show self-reversal tips at the un-shifted resonance wavelength of the hydrogen alpha line of the Balmer series. Typical "fingerprints" due to re-absorption include self-reversal and line-shape distortions [2][3][4][5][6][7][8] . In this work, two parameters distinguish between these effects.…”