Naslov
Laser produced plasmas studied by cavity ring-down spectroscopy

Autori
Krstulović, Nikša

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
BIT's 4th Annual Conference and EXPO of Analytix- 2015 Abstract Book / Chen, Yuki ; Mei, Xiaodan - Nanjing, 2015, 241-241

Skup
BIT's 4th Annual Conference and EXPO of Analytix- 2015

Mjesto i datum
Nanjing, Kina, 25.05.2015. - 28.05.2015

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Laser ablation; laser plasma; plasma dynamics; cavity-ring down spectroscopy

Sažetak
Today, laser produced plasmas (LPP) are present in many fields of research. They are used as a source of different particles such as: energetic photons (EUV/XUV), protons, atoms, radicals, ions, new molecules of interest, etc. One of the recent uses of laser produced plasmas is as a source of high harmonic generation (HHG) for development of table-top attosecond X-ray lasers or table-top accelerators and as a source for EUV/XUV photolithography of new generation. Moreover, besides production, LPP found its application in diagnostic methods such as laser induced breakdown spectroscopy (LIBS) which is mainly used for material analysis. In order to improve material removal rate and, consequently, diagnostic potential of laser ablation (limit of detection and signal to noise improvement), often a second laser pulse is introduced with a certain time delay with respect to the first pulse in a form of double-pulse laser ablation. Double-pulse laser ablation is recently attracting attention related to applications using LIBS for enhanced elemental analysis. In this work the temporal and spatial evolution of the ablated plume (in single and double mode of ablation) was studied using cavity ring-down spectroscopy (CRDS), an absorption technique which provides information not only about excited species but also on ground state or metastable particles of the plume which otherwise cannot be addressed with emission techniques. The CRDS technique applied to laser ablation provides time-of-flight information and therefore both the density evolution of various species within the plume and plume dynamics can be monitored. CRDS is one of the most sensitive analytical techniques allowing determination of gaseous species in ppb or even ppt range (trace elements). In addition a numerical model to describe the measurements of the absorption spectral lineshapes of atoms observed within the laser ablated plasma plume by CRDS has been developed. Forward convolution absorption lineshapes were fitted to the experimental profiles, thus providing full information about the plume dynamics.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA