公开(公告)号：US5248882A

公开(公告)日：1993-09-28

申请号：US890623

申请日：1992-05-28

申请人： Zhenmin Liang

发明人： Zhenmin Liang

IPC分类号： G01N27/62 ,  B01D59/44 ,  H01J49/38 ,  H01J49/42

CPC分类号： H01J49/38 ,  B01D59/44 ,  H01J49/424 ,  H01J49/427

摘要： Tailored excitation of ions in a mass spectrometer is obtained by using an excitation signal which comprises at least one signal having the form of a sinc function modulated sine wave. The sinc modulated sine wave has a magnitude function in the frequency domain in the form of a rectangular function centered at the frequency of the sine wave and having a width determined by the width of the sinc function. Plural sinc modulated sine wave signals can be applied to the ion trap of the spectrometer, with the various signals having different sine wave frequencies, to provide a tailored excitation spectrum without the need for extended computation.

公开(公告)号：US5644129A

公开(公告)日：1997-07-01

申请号：US595681

申请日：1996-02-02

申请人： Chang S. Hsu ,  Saul C. Blum ,  Zhenmin Liang ,  Peter B. Grosshans ,  Winston K. Robbins

发明人： Chang S. Hsu ,  Saul C. Blum ,  Zhenmin Liang ,  Peter B. Grosshans ,  Winston K. Robbins

IPC分类号： G01N30/72 ,  G01N33/28 ,  B01D59/44 ,  H01J49/00

CPC分类号： H01J49/168 ,  G01N33/2829 ,  G01N30/7286

摘要： The present invention is a method to distinguish and measure normal paraffins, isoparaffins, and naphthenes in a saturated hydrocarbon mixture. The method includes the step of field-ionizing hydrocarbon mixture; separating the normal paraffins, isoparaffins and naphthenes as a separate saturates class; and detecting the normal paraffins as molecular ions, naphthenes as molecular ions, and isoparaffins as fragment ions.

摘要翻译： 本发明是在饱和烃混合物中区分和测量正构链烷烃，异链烷烃和环烷烃的方法。 该方法包括对烃混合物进行场电离的步骤; 将正链烷烃，异链烷烃和环烷烃分离为独立的饱和物类; 并检测作为分子离子的正构烷烃，作为分子离子的环烷烃和作为碎片离子的异链烷烃。