B <chr_abbr type="reg" class="dc" expan="" cert="no">n-hbar</chr_abbr><chr_var letter="s" var="long">∫</chr_var>ai<chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr>n .j. e<chr_var letter="s" var="long">∫</chr_var><chr_abbr type="reg" class="sc" expan="tra" cert="no">t-alpha</chr_abbr>ngeliu 