Methylene ion (CH2+) Energy (eV) BEB (A^2) 22.17 0.000 22.50 0.004 23.00 0.011 23.50 0.017 24.00 0.024 26.00 0.050 28.00 0.091 30.00 0.147 32.00 0.201 34.00 0.258 36.00 0.322 38.00 0.381 40.00 0.436 45.00 0.554 50.00 0.647 55.00 0.720 60.00 0.777 65.00 0.820 70.00 0.853 75.00 0.879 80.00 0.897 85.00 0.910 90.00 0.919 95.00 0.925 100.00 0.928 105.00 0.929 110.00 0.928 115.00 0.925 120.00 0.922 125.00 0.917 130.00 0.911 135.00 0.905 140.00 0.899 145.00 0.892 150.00 0.884 160.00 0.869 170.00 0.853 180.00 0.837 190.00 0.821 200.00 0.805 210.00 0.790 220.00 0.774 230.00 0.760 240.00 0.745 250.00 0.731 300.00 0.667 350.00 0.613 400.00 0.567 450.00 0.528 500.00 0.494 550.00 0.464 600.00 0.438 650.00 0.415 700.00 0.394 750.00 0.376 800.00 0.359 850.00 0.344 900.00 0.330 950.00 0.317 1000.00 0.305 1100.00 0.284 1200.00 0.266 1300.00 0.251 1400.00 0.237 1500.00 0.225 1600.00 0.214 1700.00 0.204 1800.00 0.195 1900.00 0.187 2000.00 0.179 2100.00 0.172 2200.00 0.166 2300.00 0.160 2400.00 0.155 2500.00 0.150 2600.00 0.145 2700.00 0.141 2800.00 0.137 2900.00 0.133 3000.00 0.129 4000.00 0.102 5000.00 0.084