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Single-Photon Ionization Mass Spectrometry Using a Vacuum Ultraviolet Femtosecond Laser.
Journal of the American Society for Mass Spectrometry ( IF 3.2 ) Pub Date : 2020-07-15 , DOI: 10.1021/jasms.0c00154
Thang Dinh Phan 1 , Adan Li 1, 2 , Hiroshi Nakamura 1 , Tomoko Imasaka 3 , Totaro Imasaka 1, 4
Affiliation  

The wavelength of a femtosecond Ti:sapphire laser (TS, 800 nm) was converted into the ultraviolet (UV, 200 nm) using three β-barium borate crystals (β-BaB2O4) for frequency doubling and subsequent mixing. The UV pulse was further converted into the vacuum ultraviolet (VUV, 185 nm) based on four-wave Raman mixing, in which a two-color pump beam consisting of the fundamental beam (800 nm) of the TS and the signal beam of an optical parametric amplifier (1200 nm) pumped by the TS was focused onto a capillary waveguide filled with hydrogen gas for molecular phase modulation and the single-color UV probe beam (200 nm) was then focused onto the waveguide for frequency modulation to generate anti-Stokes and high-order Stokes Raman sidebands at wavelengths of 185 and 218-267 nm, respectively. The efficiency of conversion from the UV (200 nm) to the VUV (185 nm) was 6%. The ionization energy was calculated for 13 amino polycyclic aromatic hydrocarbons using density functional theory, since they are associated with the development of occupational bladder cancers. The values calculated by the B3LYP/cc-pVDZ and ωB97Xd/cc-pVTZ methods were 6.24-7.14 eV (199-174 nm) and 6.41-7.35 eV (194-169 nm), respectively. A sample containing a mixture of 9-aminoanthracene, 3-aminofluoranthene, and 1-aminopyrene was separated by gas chromatography (GC), and the eluents were ionized with the VUV pulse (0.015 μJ) in mass spectrometry (MS). The analytes were observed on a two-dimensional display of GC/MS, and the detection limit obtained by single-photon ionization of 3-aminofluoranthene was 1 ng/μL.

中文翻译:

使用真空紫外飞秒激光的单光子电离质谱。

使用三个β硼酸钡晶体(β-BaB2O4)将飞秒的Ti:蓝宝石激光(TS,800 nm)的波长转换为紫外线(UV,200 nm)以进行倍频和随后的混合。根据四波拉曼混合,将紫外线脉冲进一步转换为真空紫外线(VUV,185 nm),其中,由TS的基波光束(800 nm)和Ts的信号光束组成的双色泵浦光束。 TS泵浦的光学参量放大器(1200 nm)聚焦到充满氢气的毛细管上进行分子相调制,然后将单色UV探测光束(200 nm)聚焦到波导上进行频率调制以产生抗斯托克斯和高阶斯托克斯拉曼边带的波长分别为185和218-267 nm。从UV(200 nm)到VUV(185 nm)的转换效率为6%。使用密度泛函理论计算了13种氨基多环芳烃的电离能,因为它们与职业性膀胱癌的发展有关。通过B3LYP / cc-pVDZ和ωB97Xd/ cc-pVTZ方法计算得出的值分别为6.24-7.14 eV(199-174 nm)和6.41-7.35 eV(194-169 nm)。通过气相色谱(GC)分离包含9-氨基蒽,3-氨基荧蒽和1-氨基py的混合物的样品,并在质谱(MS)中用VUV脉冲(0.015μJ)将洗脱液电离。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检出限为1 ng /μL。使用密度泛函理论计算了13种氨基多环芳烃的电离能,因为它们与职业性膀胱癌的发展有关。通过B3LYP / cc-pVDZ和ωB97Xd/ cc-pVTZ方法计算得出的值分别为6.24-7.14 eV(199-174 nm)和6.41-7.35 eV(194-169 nm)。通过气相色谱(GC)分离包含9-氨基蒽,3-氨基荧蒽和1-氨基py的混合物的样品,并在质谱仪(MS)中用VUV脉冲(0.015μJ)将洗脱液电离。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检测限为1 ng /μL。使用密度泛函理论计算了13种氨基多环芳烃的电离能,因为它们与职业性膀胱癌的发展有关。通过B3LYP / cc-pVDZ和ωB97Xd/ cc-pVTZ方法计算得出的值分别为6.24-7.14 eV(199-174 nm)和6.41-7.35 eV(194-169 nm)。通过气相色谱(GC)分离包含9-氨基蒽,3-氨基荧蒽和1-氨基py的混合物的样品,并在质谱(MS)中用VUV脉冲(0.015μJ)将洗脱液电离。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检测限为1 ng /μL。因为它们与职业性膀胱癌的发展有关。通过B3LYP / cc-pVDZ和ωB97Xd/ cc-pVTZ方法计算得出的值分别为6.24-7.14 eV(199-174 nm)和6.41-7.35 eV(194-169 nm)。通过气相色谱(GC)分离包含9-氨基蒽,3-氨基荧蒽和1-氨基py的混合物的样品,并在质谱仪(MS)中用VUV脉冲(0.015μJ)将洗脱液电离。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检测限为1 ng /μL。因为它们与职业性膀胱癌的发展有关。通过B3LYP / cc-pVDZ和ωB97Xd/ cc-pVTZ方法计算得出的值分别为6.24-7.14 eV(199-174 nm)和6.41-7.35 eV(194-169 nm)。通过气相色谱(GC)分离包含9-氨基蒽,3-氨基荧蒽和1-氨基py的混合物的样品,并在质谱(MS)中用VUV脉冲(0.015μJ)将洗脱液电离。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检测限为1 ng /μL。然后通过气相色谱(GC)分离1-氨基py,并在质谱(MS)中用VUV脉冲(0.015μJ)洗脱洗脱液。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检测限为1 ng /μL。然后通过气相色谱法(GC)分离1-氨基py,并在质谱(MS)中用VUV脉冲(0.015μJ)将洗脱液离子化。在GC / MS的二维显示器上观察到分析物,并且通过3-氨基荧蒽的单光子电离获得的检测限为1 ng /μL。
更新日期:2020-07-15
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