L-S coupling and term symbol

L-S युगमन (l-s coupling):-
                                        Angular orbital momentum एवं spin angular momentum के मदय अंतक्रिया को L-S coupling कहते है। 
L-S coupling के कारण एक नया क्वांटम उतपन्न होता है।हम जानते है कि molecule मे दो या दो से अधिक  इलेक्ट्रान होते है, जिसके कारण orbital angular momentum उत्पन्न होता है। 
अयुग्मित इलेक्ट्रोनो की संख्या बढ़ने पर angular momentum का मान बढ़ जाता है इस कारण l-l coupling होती है। l-l coupling के कारण उतपन्न कुल momemtum को L-vector से दर्शाते है। इसे total angular momentum कहते है।

ज़ब इलेक्ट्रान अपनी अछ (spin) पर घूर्णन करता है तो spin angular momentum उतपन्न होता है।
ज़ब अणु मे एक से अधिक इलेक्ट्रान होते है तब उत्पन्न होने moment को s-s coupling कहते है तथा total spin angular moment को S-vector कहते है
L-S coupling and term symbols :-
                                                          The interaction between orbital angular momentum with spin angular momentum is called L-S coupling.
Due to L-S coupling a new quantum number generated.
As we know a molecule contain two or more than two atom and contain many electron due to the orbital angular momentum of electron orbital angular momentum is generated it is denoted by L -factor , if we have two and more than two unpaired electron.
Then angular momentum various of coupling with each other This type of coupling is called L-L coupling .
Due to the L-Lcoupling a new vector is called generated which is represented by L and it is known as total orbital angular quantum number.
Due to the rotation of electron on its existe spin angular momentum is generated it is denoted by S
If coupling of two spin angular momentum take place than it is known as s-s coupling
Due to the s-s coupling a new vector S is generated that is called total spin angular quantum number.
L = l
S= 2s+1
If coupling take place between total quantum number  (L) and total spin quantum number  (s) issue called spin quantum number
It is called also R-S coupling.
R-S= ruzell - sanders
Term symbol :-
                                    (2s +1)
Where-              S= n/2
               n= unpaired electron
   Symbol =     (2s+1)Lj