TITLE:
Development of Multiphoton Ionization Technique for Detection of Polycyclic Aromatic Hydrocarbon (PAH) in Solution
AUTHORS:
Hoa Do Quang, Duong Vu, Nghia Nguyen Trong, Totaro Imasaka
KEYWORDS:
UV Laser, Multiphoton Ionization, Polycyclic Aromatic Hydrocarbon
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.5 No.10,
October
27,
2015
ABSTRACT: A simple low-cost system for detection of polycyclic aromatic hydrocarbon (PAH) in solution based on multiphoton ionization configuration is designed using a circulating ionization cell of 0.1 × 2 × 5 mm dimension with quartz optical window. Fourth harmonic emission of Nd:YAG laser (266 nm, 6 ns, 10 Hz, and 2 mJ) and second harmonic generation of distributed feedback dye laser (278 - 286 nm, 20 ps, 10 Hz, and 300 μJ) were used as the ionization source. A high voltage of 800 V was applied to separate the ions after ionization. The photocurrent includes a sharp peak and a broad tail indexed to electron and ion currents, respectively. The lowest concentration of anthraxcene (C14H10) in order of few nano-grams per milliliter was detected by this multiphoton ionization configuration.