{"created":"2025-02-13T05:04:43.510286+00:00","id":2000274,"links":{},"metadata":{"_buckets":{"deposit":"d9971093-a5bd-477e-b690-9a95605025b8"},"_deposit":{"created_by":41,"id":"2000274","owners":[41],"pid":{"revision_id":0,"type":"depid","value":"2000274"},"status":"published"},"_oai":{"id":"oai:hiroshima.repo.nii.ac.jp:02000274","sets":["1730444918938"]},"author_link":[],"control_number":"2000274","item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_title":"EinsteinのA係数とB係数","subitem_title_language":"ja"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"山崎, 勝義","creatorNameLang":"ja"},{"creatorName":"Yamasaki, 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Author","subitem_rights_language":"en"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_subject":"EinsteinのA係数","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"EinsteinのB係数","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"分光放射エネルギー密度","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"光のエネルギー密度","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"光吸収断面積","subitem_subject_language":"ja","subitem_subject_scheme":"Other"},{"subitem_subject":"430","subitem_subject_scheme":"NDC"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"物質による光の吸収や放出(発光)について学ぼうとすると，例外なくEinsteinのA係数とB係数に遭遇する。A係数は励起状態にある分子(原子も含む)の発光しやすさの定量的尺度であり，励起分子が数密度n*(単位：m^−3)で存在するとき，A係数とn*との積A・n*が単位時間，単位体積あたりに光を自然放出する分子の数(単位：m^−3⋅s^−1)，つまり，単位時間，単位体積あたりに放出される光子の数を与える。一方，B係数は光の吸収しやすさの尺度であるが，数密度n(単位：m^−3)で存在する分子に光が照射されるとき，単位時間，単位体積あたりに光を吸収する分子の数がB・nで表されるかというと，そうではない。正しくは，B・ρ・nであり，分光放射エネルギー密度ρが必要となる。まず，ρの単位について考えると，エネルギー密度という名称であるからJ⋅m^−3 という単位をもつと考えてしまいがちであるが，これは誤りである。たとえば，ρの代表例であるPlanckの式ρ(ν)の単位はJ⋅m^−3⋅sであり，時間sが含まれる。そこで，エネルギーの密度という名称なのになぜ時間が入ってくるのか，「単位体積あたりのエネルギー×時間」とは何なのか，などなど疑問があふれ出てくることになる。また，Bについては，単位J⋅m^−3⋅sをもつρとの積でs^−1という単位を与えるから単位J^−1⋅m^3⋅s^−2をもつことは間違いないが，物理量の意味を想像できるような単位ではないので，途方に暮れてしまうことになる。本書は，ρの単位に関する疑問を解き，EinsteinのA係数とB係数の中身および係数同士の関係，さらに，光吸収断面積(吸光係数)とEinstein係数との関係を理解するために書かれたmonographである。","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"第7版第9刷","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_publisher":"漁火書店","subitem_publisher_language":"ja"}]},"item_1617186660861":{"attribute_name":"Date","attribute_value_mlt":[{"subitem_date_issued_datetime":"2024-10-20","subitem_date_issued_type":"Created"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_1617258105262":{"attribute_name":"Resource 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