Accurate analysis of Cu isotopes by fs-LA-MC-ICP-MS with non-matrix-matched calibration

In situ precise determination of stable Mo isotope ratios in molybdenite by femtosecond LA-MC-ICP-MS

“…This, in turn, can result in isotope fractionation during the laser ablation and transport processes. 33,52 Several experiments have demonstrated that higher uence can lead to signicant deviations and inadequate precision in isotope ratio measurements for Cu, Fe and Zn isotopes using LA-MC-ICP-MS. 32,47,53 In this study, we investigated the effect of different laser uences on the Mo isotope mass fractionation using the femtosecond laser ablation system. The experiments have been carried out under the conditions of a line scan speed of 1 mm s −1 , a laser repetition rate of 10 Hz and a circle spot size of 20 mm.…”

“…Therefore, this study adopted a relatively lower laser energy density (1 J cm −2 ) for in situ Mo isotope ratio measurements. 32,42 reported the signicant impacts of laser repetition rate on the analysis of Zn and Cu isotopes, respectively. To investigate the effect of laser repetition rate on Mo isotope measurement, we conducted experiments on Mo isotopes using different frequencies ranging from 2 to 20 Hz.…”

“…Previous studies have revealed that high-precision isotope ratios can be obtained by using matrixmatched external calibration. 31,32 Moreover, femtosecond lasers have been found to effectively minimize the interference from matrix effects during isotope analysis. [33][34][35] This is because the pulse width of a femtosecond laser (10-15 s) is shorter than the time required for electron-lattice heating.…”

Development of three chalcopyrites and one copper metal as potential reference materials for copper isotopic analysis by LA‐MC‐ICP‐MS

“…In recent years, laser ablation multicollector inductively coupled plasma mass spectrometry (LA‐MC‐ICP‐MS) has been successfully used to determine the in situ copper isotopic compositions of several kinds of Cu‐rich minerals 9–17 . Employing a 780‐nm near‐infrared (NIR) femtosecond (fs) LA‐MC‐ICP‐MS system, Ikehata et al developed an in situ Cu isotope ratio measurement method for Cu metals and Cu sulfides with a precision of better than 0.14‰ (2 standard deviations [SD]), and instrument mass fractionation was corrected by the matrix‐matched standard‐sample‐standard bracketing (SSB) method 13 .…”

“…[5][6][7][8] In recent years, laser ablation multicollector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) has been successfully used to determine the in situ copper isotopic compositions of several kinds of Cu-rich minerals. [9][10][11][12][13][14][15][16][17] Employing a 780-nm nearinfrared (NIR) femtosecond (fs) LA-MC-ICP-MS system, Ikehata et al…”