pendix ve show that&t&„(r, X) = (1+n, ~ R/2%+zIjr R/%) it&&I(r)e'x'xis an approximate ei.genfunction of H, characteriz™ing an atom of momentum R, where Ij =- 6+Zn/S".In proving this we have ignored certain terms oforder mKB/1'f and'-R 6/M, and therefore in Eq.(4) the term Air K/NI could just as well be replacedby iIjr R/M. Moreover, the energy eigenvaluecorresponding to Eq. (4) is 3f&'. +R'/Mlf. However,K~/2N could just as well be K~/2(m+M)since our approximations are not accurate enoughto obtain the exact kinetic-energy term R3/2Mf.Recently Brodsky and Primack have given asolution of the Breit equation which also includesc.m. motion. We would like to compare and contrasttheir result with Eq. (4). The approach ofthe present work has been to assume the validity(approximate) of the Breit equation in the laboratoryframe and to separate the interaction into aninstantaneous and a, transverse part in that frame.The Hamiltoni. an is Dot separable in conventionalrelative and c.m. variables as in the no»relativisticcase. However, it is possible to obtain thewave function for the slowly moving atom once thewave function &~&0(r) of the stationa, ry atom is known.Brodsky and Primack assume a Breit equationin the c.m, frame of the atom, and that the intera,ction separates into a Coulomb and Breit part(they drop the Breit part since their work does notI'equ11'6 1't). At t1118 s'tage R single-time formalismexists in the c.m. frame. The wave function forthe moving atom is obtained by performing appropriateI.orentz boosts of the c.m. wave function. "This procedure is perfectly natural, but it shouldbe remembered that the boosted solution is actuallya solution of the BS equation in the laboratoryframe. This solution is a. two-time wave functionand, moreover, lt satisfies a BS equation l» whichthe gauge is no longer the Coulomb gauge and theinteraction is no longer instantaneous.Using our approach, the electromagnetic interactionsof a composite system are described byminimally coupling the Breit equation in t]he laboratoryframe, whereas in the approach of Ref. 4 theBS equation in the lab frame corresponding to theassumed c, .m. conditions must be mlnlmauycoupled. ' For the work described in this paperwe prefer the former method, although the lattermethod would appear to be advantageous in itsha, Ddllng of covarlance.
 
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pendix ve show that<br>&t&„(r, X) = (1+n, ~ R/2%+zIjr R/%) it&&I(r)<br>e'x'x<br>is an approximate ei.genfunction of H, characteriz™<br>ing an atom of momentum R, where Ij =- 6+Zn/S".<br>In proving this we have ignored certain terms of<br>order mKB/1'f and'-R 6/M, and therefore in Eq.<br>(4) the term Air K/NI could just as well be replaced<br>by iIjr R/M. Moreover, the energy eigenvalue<br>corresponding to Eq. (4) is 3f&'. +R'/Mlf. However,<br>K~/2N could just as well be K~/2(m+M)<br>since our approximations are not accurate enough<br>to obtain the exact kinetic-energy term R3/2Mf.<br>Recently Brodsky and Primack have given a<br>solution of the Breit equation which also includes<br>c.m. motion. We would like to compare and contrast<br>their result with Eq. (4). The approach of<br>the present work has been to assume the validity<br>(approximate) of the Breit equation in the laboratory<br>frame and to separate the interaction into an<br>instantaneous and a, transverse part in that frame.<br>The Hamiltoni. an is Dot separable in conventional<br>relative and c.m. variables as in the no»relativistic<br>case. However, it is possible to obtain the<br>wave function for the slowly moving atom once the<br>wave function &~&0(r) of the stationa, ry atom is known.<br>Brodsky and Primack assume a Breit equation<br>in the c.m, frame of the atom, and that the intera,<br>ction separates into a Coulomb and Breit part<br>(they drop the Breit part since their work does not<br>I'equ11'6 1't). At t1118 s'tage R single-time formalism<br>exists in the c.m. frame. The wave function for<br>the moving atom is obtained by performing appropriate<br>I.orentz boosts of the c.m. wave function. "<br>This procedure is perfectly natural, but it should<br>be remembered that the boosted solution is actually<br>a solution of the BS equation in the laboratory<br>frame. This solution is a. two-time wave function<br>and, moreover, lt satisfies a BS equation l» which<br>the gauge is no longer the Coulomb gauge and the<br>interaction is no longer instantaneous.<br>باستخدام نهجنا، والتفاعلات الكهرومغناطيسية <br>وصفها نظام مركب من <br>اقتران الحد الأدنى من المعادلة Breit في ر] كان مختبر <br>الإطار، في حين أنه في نهج المرجع. (4) و <br>المعادلة BS في إطار مختبر المقابلة ل <br>ج المفترضة،. م. الشروط التي يجب mlnlmauy <br>جانب. "للمشاركة في أعمال وصفها في هذه الورقة <br>نحن نفضل الطريقة السابقة، على الرغم من أن الأخير <br>طريقة ما يبدو ليكون من المفيد في تقريرها <br>هكتار، Ddllng من covarlance.
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