Rickman R D, Verkhoturov S V, Parilis E S, Schweikert E A
Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.
Phys Rev Lett. 2004 Jan 30;92(4):047601. doi: 10.1103/PhysRevLett.92.047601. Epub 2004 Jan 27.
We present the first experimental data on the simultaneous ejection of two molecular ions from the impact of Au(+)(n) (1< or =n< or =4) with energies ranging between 17 and 56 keV. The yields from single phenylalanine (Ph) emission, coemission of two Ph ions, and emission of the Ph dimer were measured. Large increases (1 to 2 orders of magnitude) in coemitted ion yields were observed with increasing projectile energy and complexity. Correlation coefficients were calculated for the coemission of two Ph ions; their behavior suggests differences in emission pathways for bombardment by atomic and polyatomic projectiles.
我们展示了关于金离子（Au(+)(n)，1≤n≤4）在能量范围为17至56 keV时撞击产生两个分子离子同时喷射的首批实验数据。测量了单个苯丙氨酸（Ph）发射、两个Ph离子的共发射以及Ph二聚体发射的产率。随着入射粒子能量和复杂度的增加，共发射离子产率大幅增加（1至2个数量级）。计算了两个Ph离子共发射的相关系数；它们的行为表明原子和多原子入射粒子轰击的发射途径存在差异。
