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Method and apparatus for high-order differential mobility separations

  • US 7,449,683 B2
  • Filed: 09/28/2005
  • Issued: 11/11/2008
  • Est. Priority Date: 09/28/2005
  • Status: Expired due to Fees
First Claim
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1. An ion mobility method for separation, characterization, or identification of ions, comprising the steps:

  • introducing said ions into an analytical gap filled with a gas;

    establishing a periodic time-dependent electric field of intensity E over said analytical gap, said periodic time-dependent electric field cancels contributions to time-averaged ion motion of a number, n (where n≧

    2), of leading terms in a series expansion for ion mobility, K, as a function of E/N (where N is number density of said gas), via a polynomial in powers of E/N;


    K(E/N)=K(0)[1+a(E/N)2+b(E/N)4+c(E/N)6+d(E/N)8+. . . aj(E/N)2j];

    thereby achieving separation, characterization, or identification of said ions based substantially on coefficients with the (n+1)th and subsequent terms of said series expansion;

    aj where j=n−

    1.

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