β Scribed by Kyuseok Song; Hyungki Cha; Jongmin Lee; Igor Kolpakov
No coin nor oath required. For personal study only.
Excited states and autoionization states of the erbium atom were investigated by the use of multicolor resonance ionization mass spectrometry. Among the observed first excited states, a level [4f 12 ( 3 H 6 )6s6p( 3 P 1 )] located 17,348 cm 01 from the ground state is regarded as the most efficient state for excitation within the wavelength range investigated (560-600 nm), while a level located 17,080 cm 01 from this first excited state (E Γ 34,458 cm 01 ) is identified as the best second excited state for the optimal photoionization scheme. Many ionization schemes adopting an autoionization state are also investigated, and the most efficient scheme is identified as 4f 12 6s 2 ( 3 H 6 ) r 4f 12 ( 3 H 6 )6s6p( 3 P 0 1 ), 17,348 cm 01 r 34,458 cm 01 r continuum state, which corresponds to the two-color (v 1 / v 2 / v 1,2 ) scheme. Various concentrations of standard solutions for erbium are determined and the minimum amount detectable by two-color threephoton ionization was determined to be 20 pg.
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