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বামার সারির তৃতীয় রেখার উৎপত্তির কারণ হলো ইলেকট্রনের $n_5 \to n_2$ স্থানান্তর।

বামার সিরিজের ক্ষেত্রে, ইলেকট্রন উচ্চ শক্তিস্তর থেকে $n=2$ শক্তিস্তরে স্থানান্তরিত হয়।

প্রথম রেখা: $n_3 \to n_2$

দ্বিতীয় রেখা: $n_4 \to n_2$

তৃতীয় রেখা: $n_5 \to n_2$

ইলেকট্রনের কোন স্থানান্তর বামার সারির তৃতীয় রেখার উৎপত্তির কারণ-