Potential Energy Surface of NO on Pt(997): Adsorbed States and Surface Diffusion

<table>A schematic drawing for the estimation of transient diffusion length of NO on Pt(997). The shadowed regions and the other regions are regarded as the step region and the terrace region, respectively. <svg height="11.9625" id="M73" style="vertical-align:-3.39066pt" version="1.1" viewbox="0 0 11.175 11.9625" width="11.175" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,7.675)"><path d="M393 379q-9 -16 -28 -29q-15 -10 -23 -2q-19 19 -36 19q-21 0 -52 -38q-57 -72 -82 -126l-40 -197q-23 -3 -75 -18l-7 7q49 196 74 335q7 43 -2 43q-7 0 -30 -14.5t-47 -37.5l-16 23q37 42 82 73t67 31q41 0 15 -113l-11 -50h4q41 71 85 117t77 46q29 0 45 -26
q13 -21 0 -43z" id="x1D45F"></path></g>
<g transform="matrix(.012,0,0,-.012,7.238,11.763)"><path d="M244 607q0 -25 -15.5 -43t-37.5 -18q-19 0 -32 13t-13 35q0 21 15 41t39 20q20 0 32 -14t12 -34zM222 91q-29 -33 -79 -68t-75 -35q-13 0 -19 7.5t-6 31t10 65.5l62 253q5 26 -1 26q-21 0 -72 -43l-13 24q43 40 91 68t71 28q30 0 10 -78l-71 -274q-8 -30 3 -30
q16 0 76 48z" id="x1D456"></path></g>
</svg> and <svg height="14.925" id="M74" style="vertical-align:-5.76984pt" version="1.1" viewbox="0 0 15.5625 14.925" width="15.5625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,7.675)"><path d="M393 379q-9 -16 -28 -29q-15 -10 -23 -2q-19 19 -36 19q-21 0 -52 -38q-57 -72 -82 -126l-40 -197q-23 -3 -75 -18l-7 7q49 196 74 335q7 43 -2 43q-7 0 -30 -14.5t-47 -37.5l-16 23q37 42 82 73t67 31q41 0 15 -113l-11 -50h4q41 71 85 117t77 46q29 0 45 -26
q13 -21 0 -43z" id="x1D45F"></path></g>
<g transform="matrix(.012,0,0,-.012,7.238,11.763)"><path d="M619 670q0 -13 -9 -26t-18 -19q-13 -10 -25 2q-36 38 -66 38q-31 0 -54.5 -50t-45.5 -185h120l-20 -31l-107 -12q-23 -138 -57 -293q-27 -122 -55 -184.5t-75 -109.5q-60 -61 -114 -61q-25 0 -47.5 15t-22.5 31q0 17 31 44q11 8 20 -1q10 -11 31 -19t35 -8q26 0 47 19
q34 34 71 253l54 315h-90l-3 12l31 30h70q28 138 90 204q35 37 75 57.5t70 20.5q26 0 45 -14t19 -28z" id="x1D453"></path></g>
</svg> are an initial collision site and a final adsorption site, respectively. By considering the ratio of NO on the step to that on the terrace, the transient diffusion length <svg height="15" id="M75" style="vertical-align:-2.22495pt" version="1.1" viewbox="0 0 18.737499 15" width="18.737499" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,12.163)"><path d="M360 -163h-62l-192 430v6l192 430h62l-193 -433z" id="x27E8"></path></g><g transform="matrix(.017,0,0,-.017,7.083,12.163)"><path d="M238 681l-124 -585q-7 -31 4 -31q10 0 37.5 18.5t49.5 41.5l16 -22q-40 -48 -89.5 -81.5t-76.5 -33.5q-42 0 -16 122l105 488q7 32 0 41t-39 9h-35l5 26q35 3 71 13t58 17.5t26 7.5q14 0 8 -31z" id="x1D459"></path></g><g transform="matrix(.017,0,0,-.017,11.656,12.163)"><path d="M307 267l-192 -430h-62l193 433l-193 433h62l192 -430v-6z" id="x27E9"></path></g>
</svg> can be estimated based on Buffon’s needle problem [<a href="/journals/apc/2012/571657/#B2">2</a>, <a href="/journals/apc/2012/571657/#B14">14</a>].</table>

Advances in Physical Chemistry

fig9

Figure 9

Figure 9: Potential Energy Surface of NO on Pt(997): Adsorbed States and Surface Diffusion 