O2    ICE
  (density of 2.4x10^22 molecules/cm^3 used to calculate electronic
   [dE/dx]e and collisional [dE/dx]n energy loss in eV/A#. The incident
     angle is zero unless indicated.)

  ion    E(keV)     v(au)      T(K)    angle    Yield   [dE/dx]e    [dE/dx]n   ref


     e            1             8.56       3-14                     3.7                                               (1)
                1.25           9.57                                    3.2
                1.5           10.48                                    2.8
                1.75         11.32                                    2.5
                   2           12.10                                     2.1
                2.25         12.84                                    1.8
                2.5           13.53                                    1.75
                2.75         14.19                                    1.6
                   3           14.82                                     1.5
 

  H+          5              0.45       15-20                   13.0          2.01             0.105        (2)
                  6              0.49                                    14.6          2.18             0.094
                  8              0.57                                    19.6          2.48             0.079
                 10             0.63                                      22           2.74             0.069

  H2+        3              0.25                                      28           2.34              0.370
                  4              0.28                                      21           2.66             0.330
                  5              0.32                                    32.5          2.94             0.299

  H3+      1.5            0.14                                     15.0          2.14              0.736
                  2             0.16                                     18.8          2.44             0.699
                  3             0.20                                     22.7          2.92             0.633
                3.5            0.22       15-20                   30.0          3.17             0.599

  H+      3500           11.8           10                       0.96         1.152           0.0006        (3)
              3000           10.98                                     1.1         1.292           0.0007
              2500           10.03                                    1.24        1.480           0.0008
              2000            8.97                                     1.15        1.763           0.0010
              1500            7.77                                     1.7          2.123           0.0013
              1000            6.34                                     2.7          2.778           0.0019
               850             5.67                                     4.7          3.197           0.0023
               500             4.48                                     4.8          4.214           0.0034
               350             3.75                                     5.5          5.083           0.0046
               300             3.47                                     7.3          5.458           0.0052


  ion    E(keV)     v(au)      T(K)    angle    Yield    [dE/dx]e     [dE/dx]n      ref


 He+(He^q+)*
              750              2.75           10                      27(32)       20.55           0.0330     (3) (4)*
              635              2.53                                     41(49)       20.26           0.0378
              500              2.24                                     60(72)       19.27           0.0460
              375              1.94                                     75(90)       17.41           0.0588
              250              1.59                                   140(170)     14.57           0.0808

  H+    1500              7.77            8                          1.3          2.123            .0013          ?
              800              5.67                                        3.4          3.197            .0023
 

  He+   2500             5.01                                         34          14.63            .0188         (5)
             2000             4.48                                         54          16.33            .0143
             1500             7.77                                        109         18.36            .0183
                                                                                 (116)
                                                                                 (114)
                                                                                 (109)
                                                                                 (133)
                                                                                 (123)
                                                                                 (119)
                                                                                 (118)

             1200             3.47             8                         154          19.61           .0221
             1000             3.17                                        192          20.29           .0258
               800             2.84                                        238          20.60           .0311
               700             2.65                                        249          20.49           .0348
               600             2.46                                        272          20.08           .0396
               500             2.24                                        307          19.27           .0460
               400             2.00                                        226          17.92           .0552
                 30             0.55                                         74            4.33            .387

              1500            3.88             8                         115          18.36           .0183
                                                     16                        110
                                                     23                        119
                                                     25                        220



# These are charge - state equilibrium stopping process from SRIM:
      http://www.research.ibm.com/ionbeams/home.htm#SRIM
 

(1)  Ellegaard, O. et al., Surface Science 167 (1986) 474-492.
(2)  Ellegaard, O. et al., Surface Science 302 (1994) 371-384.
(3)  Gibbs, K.M. et al. Phys. Rev. B38 (1988) 11001-11007.
(4)  Johnson, R.E. et al. Phys. Rev. B44 (1991) 7263-7272.
(5)  Rook, F.L. et al., Surface Science 164 (1985) 625-639.

Last Updata:  January 9, 2001
 

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