In order to study plasma plume radiation properties

a radiation model of plasma plume was established.Based on time and spatial-resolved measurements the plasma plume emission spectrum in oxygen by pulsed laser ablating copper was analyzed

and the photographs of plasma plume were given. The experimental results show that plasma emission spectra are primarily composed of atomic spectrum and univalent ion spectrum. The plasma plume has different colours in different regions

the region colour is changed with ambient gas pressure. The core region spectra are primarily composed of bremsstrahlung radiations

and the middle region spectra are primarily composed of atomic spectrum and univalent ion spectrum

while the outskirt region spectra are primarily composed of atomic spectra. The continuous background radiation comes from the bremsstrahlung radiation ejected from the electron moving near target and recombination of the electron and univalent ion near target

and the primary mechanism of atomic radiation is electron collision energy transfer and recombination of electron and univalent ion near target

while the primary mechanism of univalent ions radiation is electron collision energy transfer.