Laser-mass spectrometric studies on measurement of isotopic ratios - A comparative study using ps and ns pulsed lasers

摘要

The effect of pulse width of Nd-YAG laser on the measurement of isotopic ratios of Li and lighter rare earths is studied using an in-house developed Laser Ionization Mass Spectrometer (LIMS) facility. The picosecond (ps) laser seems to provide better data compared to nanosecond (ns) laser and ps laser at 266 nm provides less scatter in the data compared to higher wavelengths. This LIMS method is a relatively simple method to measure the isotopic abundance to within ±1%.