Pfeifer Kent B, Rumpf Arthur N
Microsensor Science and Technology Department 1744, Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185-1425, USA.
Anal Chem. 2005 Aug 15;77(16):5215-20. doi: 10.1021/ac050149z.
Measurements of the performance of a miniature, portable 12-mm-diameter, 57-mm-length low-temperature cofired ceramic (LTCC) ion mobility spectrometer drift tube were undertaken to verify models of ion transport and determine the physical shape of the ion "swarms" in the LTCC tube. Simplified two-dimensional Gaussian models of ion swarm shape were fit to measured data to extract geometrical shape parameters. Results indicate that tube-transfer function effects that produce asymmetric ion swarms are minimized in the tube reducing temporal dispersion. Data are presented that illustrate the swarm shape as a function of gate time, electric field magnitude, and total charge in the ion swarm. Characterization and understanding of the ion transport mechanisms and effects that limit the resolution and other performance parameters of miniature IMS drift tubes is essential to the development of practical, robust, portable systems for "first responder" and homeland security missions.
对一个直径12毫米、长度57毫米的微型便携式低温共烧陶瓷（LTCC）离子迁移谱仪漂移管的性能进行了测量，以验证离子传输模型，并确定LTCC管中离子“群”的物理形状。将简化的二维高斯离子群形状模型与测量数据进行拟合，以提取几何形状参数。结果表明，在该管中产生不对称离子群的管传递函数效应被最小化，从而减少了时间色散。给出的数据说明了离子群形状与门控时间、电场强度以及离子群中总电荷的函数关系。表征和理解限制微型离子迁移谱漂移管分辨率和其他性能参数的离子传输机制及效应，对于开发用于“第一响应者”和国土安全任务的实用、坚固、便携式系统至关重要。
