�ڍs�^����0. 095�`0. 30a. u. �̗̈�́A���`�E���iLi�j-�A�����j�A�n�t��X����e���U���X�y�N�g���𕪉�\0. 05eV��0. 38eV�ő��肵���B�G�l���M�[����2eV�t�߂̃s�[�N���A��Ǎ݉�����Li-2s�d�q�ɂ��v���Y�����o���h�ɋA�������B�v���Y�����͐��̕��U�������A�����̓d�q�K�X�ɂ�����d�q���֌��ʂ��A���҂��ꂽ��肸���Ə����������������B

Inelastic x-ray scattering spectra of lithium (Li)-ammonia solutions have been measured with 0. 05 and 0. 38 eV resolution for momentum transfer between 0. 095 and 0. 30a. u. The peak around 2 eV was assigned to the plasmon of delocalized Li-2s electrons. The plasmon shows a positive dispersion, indicating that correlation effects in actual nearly free electrons are considerably smaller than expected.