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(a) Work out the Clebsch-Gordan coefficients for the case s1=1/2,s2=anything. Hint: You're looking for the coefficients A and Bin

|sm=A|1212|s2(m-12)+B|12(-12)|s2(m+12)

such that|sm is an eigenstate of . Use the method of Equations 4.179 through 4.182. If you can't figure out whatSx(2) (for instance) does to|s2m2 , refer back to Equation 4.136 and the line before Equation 4.147. Answer:

;role="math" localid="1658209512756" A=s2+12m2s2+1;B=s2+12m2s2+1

where, the signs are determined bys=s21/2 .

(b) Check this general result against three or four entries in Table 4.8.

Short Answer

Expert verified

(a) The Clebsch-Gordan coefficients are, A=s2+12m2s2+1, and B=s2+12m2s2+1

(b) The result is checked for few entries.

Step by step solution

01

Introduction to few formulae

Before solving the problem, some formulae should be known,

S|sm=s(s+1)-m(m1)|sm1

Here, Sis the raising and lowering operators with an eigenstate|s

S2|sm=2s(s+1)|sm

Here,S2is the spin angular momentum operator squared with an eigenvalue2s(s+1)and an eigenstate|sm.

localid="1658209816175" Sz|sm=m|sm

Here,Szis the quantized z -component of spin angular momentum with an eigenvaluemand an eigenstae|sm.

s is the spin quantum number which is always a positive integer while m is the magnetic spin quantum number which has always a half-integer value.

A chemical bond is an atom-to-atom attraction. This attraction can be explained by differences in the behaviour of atoms' outermost or valence electrons.

02

(a) Determination of the Clebsch-Gordan coefficients for the case s1=1/2,s2= anything.

Solve the issue by creating the following relationship between the spin angular momentum operator's x -component, Sx , the spin angular momentum operator's y -component, Sy , and the spin raising and lowering operators,S ,

Sx=12S++S-Sxsm>=12S+sm>+S-sm>=h2ss+1-mm+1sm+1>ss+1-mm-1sm-1>Sy=12iS++S-Sysm>=12S+sm>+S-sm>=h2iss+1-mm+1sm+1>ss+1-mm-1sm-1>

Add angular momenta.

S=S1+S2S2=S1+S2.S1+S2=S12+S22+2S1.S2=S12+S22+2Sx1Sx2+Sy1Sy2+Sz1Sz2=S2sm>=S12+S22+2Sx1Sx2+Sy1Sy2+Sz1Sz2sm>=S12+S22+2Sx1Sx2+Sy1Sy2+Sz1Sz2A1212>s2m-12>+B1212>s2m+12>

Distribute the operators over the states.

S2sm>=AS121212>s2m-12>+BS1212-12>s2m+12>+A1212>S22s2m-12>+B12-12>S22s2m+12>+2ASx1212>Sxs2m-12>+BSx12-12>Sxs2m+12>+ASy1212>Sys2m-12>+BSy12-12>Sys2m+12>+ASz1212>Szs2m-12>+BSz12-12>Szs2m+12>=AS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>+BAS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>uncaught exception: Invalid chunk

in file: /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php line 68
#0 /var/www/html/integration/lib/php/Boot.class.php(769): com_wiris_plugin_impl_HttpImpl_1(Object(com_wiris_plugin_impl_HttpImpl), NULL, 'http://www.wiri...', 'Invalid chunk') #1 /var/www/html/integration/lib/haxe/Http.class.php(532): _hx_lambda->execute('Invalid chunk') #2 /var/www/html/integration/lib/php/Boot.class.php(769): haxe_Http_5(true, Object(com_wiris_plugin_impl_HttpImpl), Object(com_wiris_plugin_impl_HttpImpl), Array, Object(haxe_io_BytesOutput), true, 'Invalid chunk') #3 /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(30): _hx_lambda->execute('Invalid chunk') #4 /var/www/html/integration/lib/haxe/Http.class.php(444): com_wiris_plugin_impl_HttpImpl->onError('Invalid chunk') #5 /var/www/html/integration/lib/haxe/Http.class.php(458): haxe_Http->customRequest(true, Object(haxe_io_BytesOutput), Object(sys_net_Socket), NULL) #6 /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(43): haxe_Http->request(true) #7 /var/www/html/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(268): com_wiris_plugin_impl_HttpImpl->request(true) #8 /var/www/html/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(307): com_wiris_plugin_impl_RenderImpl->showImage('9f895d4bd17c841...', NULL, Object(PhpParamsProvider)) #9 /var/www/html/integration/createimage.php(17): com_wiris_plugin_impl_RenderImpl->createImage('" width="0" height="0" role="math">uncaught exception: Invalid chunk

in file: /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php line 68
#0 /var/www/html/integration/lib/php/Boot.class.php(769): com_wiris_plugin_impl_HttpImpl_1(Object(com_wiris_plugin_impl_HttpImpl), NULL, 'http://www.wiri...', 'Invalid chunk') #1 /var/www/html/integration/lib/haxe/Http.class.php(532): _hx_lambda->execute('Invalid chunk') #2 /var/www/html/integration/lib/php/Boot.class.php(769): haxe_Http_5(true, Object(com_wiris_plugin_impl_HttpImpl), Object(com_wiris_plugin_impl_HttpImpl), Array, Object(haxe_io_BytesOutput), true, 'Invalid chunk') #3 /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(30): _hx_lambda->execute('Invalid chunk') #4 /var/www/html/integration/lib/haxe/Http.class.php(444): com_wiris_plugin_impl_HttpImpl->onError('Invalid chunk') #5 /var/www/html/integration/lib/haxe/Http.class.php(458): haxe_Http->customRequest(true, Object(haxe_io_BytesOutput), Object(sys_net_Socket), NULL) #6 /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(43): haxe_Http->request(true) #7 /var/www/html/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(268): com_wiris_plugin_impl_HttpImpl->request(true) #8 /var/www/html/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(307): com_wiris_plugin_impl_RenderImpl->showImage('9f895d4bd17c841...', NULL, Object(PhpParamsProvider)) #9 /var/www/html/integration/createimage.php(17): com_wiris_plugin_impl_RenderImpl->createImage('" width="0" height="0" role="math">S2sm>=AS121212>s2m-12>+BS1212-12>s2m+12>+A1212>S22s2m-12>+B12-12>S22s2m+12>+2ASx1212>Sxs2m-12>+BSx12-12>Sxs2m+12>+ASy1212>Sys2m-12>+BSy12-12>Sys2m+12>+ASz1212>Szs2m-12>+BSz12-12>Szs2m+12>=AS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>+BAS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>S2sm>=AS121212>s2m-12>+BS1212-12>s2m+12>+A1212>S22s2m-12>+B12-12>S22s2m+12>+2ASx1212>Sxs2m-12>+BSx12-12>Sxs2m+12>+ASy1212>Sys2m-12>+BSy12-12>Sys2m+12>+ASz1212>Szs2m-12>+BSz12-12>Szs2m+12>=AS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>+BAS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>uncaught exception: Invalid chunk

in file: /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php line 68
#0 /var/www/html/integration/lib/php/Boot.class.php(769): com_wiris_plugin_impl_HttpImpl_1(Object(com_wiris_plugin_impl_HttpImpl), NULL, 'http://www.wiri...', 'Invalid chunk') #1 /var/www/html/integration/lib/haxe/Http.class.php(532): _hx_lambda->execute('Invalid chunk') #2 /var/www/html/integration/lib/php/Boot.class.php(769): haxe_Http_5(true, Object(com_wiris_plugin_impl_HttpImpl), Object(com_wiris_plugin_impl_HttpImpl), Array, Object(haxe_io_BytesOutput), true, 'Invalid chunk') #3 /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(30): _hx_lambda->execute('Invalid chunk') #4 /var/www/html/integration/lib/haxe/Http.class.php(444): com_wiris_plugin_impl_HttpImpl->onError('Invalid chunk') #5 /var/www/html/integration/lib/haxe/Http.class.php(458): haxe_Http->customRequest(true, Object(haxe_io_BytesOutput), Object(sys_net_Socket), NULL) #6 /var/www/html/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(43): haxe_Http->request(true) #7 /var/www/html/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(268): com_wiris_plugin_impl_HttpImpl->request(true) #8 /var/www/html/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(307): com_wiris_plugin_impl_RenderImpl->showImage('9f895d4bd17c841...', NULL, Object(PhpParamsProvider)) #9 /var/www/html/integration/createimage.php(17): com_wiris_plugin_impl_RenderImpl->createImage('" width="0" height="0" role="math">S2sm>=AS121212>s2m-12>+BS1212-12>s2m+12>+A1212>S22s2m-12>+B12-12>S22s2m+12>+2ASx1212>Sxs2m-12>+BSx12-12>Sxs2m+12>+ASy1212>Sys2m-12>+BSy12-12>Sys2m+12>+ASz1212>Szs2m-12>+BSz12-12>Szs2m+12>

=AS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>+BAS121212>s2m-12>+12-12>S22s2m+12>+2Sx1212>Sxs2m-12>+Sy1212>Sys2m-12>+Sz1212>Szs2m-12>

Act with the operators on the states in the above expression.

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