振动基底准位极低温KRb分子生成向分光

1、振動基底準位極低温KRb分子生成向分光解析 相川清隆A、赤松大輔A、林正泰A、上田正仁B,C、井上慎A,B日本物理学会第64回年次大会29pSD-52009.3.29東大工A、JST ERATO上田量子制御B、東大理C極低温極性分子気体双極子-双極子相互作用持新量子多体系異方的長距離相互作用等方的短距離相互作用持原子気体異振舞相互作用波制御可能 1新量子相発現予想超固体 2結晶化 3量子計算応用1次元光格子中入極性分子量子利用 4精密測定電子核子永久双極子 5定数変化 61 K.Goral et al., PRL 88, 170406 (2002)2 R.Burnett et al., PRL

2、 96, 190401 (2006)3 H.P.Buchler et al., PRL 98, 060404 (2007)4 D.DeMille, PRL 88, 067901 (2001)5 M.G.Kozlov and A.Derevianko, J.Phys.B 97, 063001 (1995)6 E.R.Hudson et al. PRL 96, 143004 (2006)振動基底準位極低温分子生成極低温原子41K、87RbFeshbach共鳴利用浅束縛41K87Rb分子生成浅束縛分子振動基底準位移行浅束縛分子衝突対不安定（寿命短）双極子小 振動基底準位誘導Raman断熱過程(STI

3、RAP)移12Feshbach共鳴光会合生成分子原子間距離浅束縛分子振動基底準位強遷移持励起準位分光的探必要性適切中間準位予想非経験的(ab initio)分子軌道計算原子間 110100cm-1程度誤差持大波動関数重(Franck-Condon因子)推定利用(3)1+状態浅束縛準位、振動基底準位大波動関数重持 2K(4P)+Rb(5S)K(4S)+Rb(5P)15x1031050-5Energy cm-112108642Internuclear separation X1a3(1)3(2)1(2)3(3)1(1)1(3)1+状態分光行1 S.Rousseau et al., J.Mol.Sp

4、ectrosc. 203, 235 (2000)2 D.Wang et al., PRA 75, 032511 (2007)分光行実験装置冷却41K、87Rb光会合浅束縛41K87Rb分子生成利用分子多光子化(REMPI)検出装置(Channeltron)分子検出、計数波長特定振動準位分子選択的化可能（通常、最数多v=91(X1+)分子分光利用）Photoassociationlaser (795.5nm)MOT lasers (6)ChanneltronPulse laser(604.5nm)CWDepletion分光光会合同時CW照射励起準位共鳴、分子数減少回転構造観測可能30252015

5、1050KRb+(v=91) ion counts arb.units11690.011689.911689.811689.7Depletion frequency cm-1J=3J=2J=1J=2J=1J=0J=0J=2J”=1J”=3X1+（基底状態）(3)1+（励起状態）得情報振動準位(励起状態)回転定数遷移強度302520151050KRb+(v=91) ion counts arb.units11690.011689.911689.811689.7Depletion frequency cm-1J=3J=2J=1J=2J=1J=0 rrrB2212：換算質量 r：動径波動関数(J=0

6、)：幅：上準位自然幅：照射時間：Rabi周波数振動準位excited10Bground6B回転定数（励起状態）回転定数（基底状態）幅) 1(rotJJBE回転定数状態識別回転定数形状敏感 回転定数観測対称性確観測回転定数(3)1+状態ab initio基計算値一致 観測状態(3)1+状態確15x1031050-5Energy cm-112108642Internuclear separation X1a3(1)3(2)1(2)3(3)1(1)1分光領域32x10-33028262422201816Rotational constant cm-111.8x10311.711.611.511.4E

7、nergy against v=91 level of X1cm-1 (1)1 (1)3 (3)1 (2)1 (2)3 Observed観測値計算値観測回転定数計算値1程度小遷移強度分布Franck-Condon因子計算値説明ab initio不正確考20.8x10-320.620.420.220.0Rotational constant cm-111.8x10311.711.611.511.4Energy against v=91 level of X1+ cm-1 Observed ab initioRotational constants against energy levels10-

8、524610-424610-324610-2Franck-Condon factor11.7x10311.611.511.4Energy cm-1 Observed ab initio potentialFranck-Condon factors against energy観測値計算値観測回転定数計算値1程度小遷移強度分布Franck-Condon因子計算値説明ab initio不正確考20.8x10-320.620.420.220.0Rotational constant cm-111.8x10311.711.611.511.4Energy against v=91 level of X1

9、+ cm-1 Observed ab initioRotational constants against energy levelsObserved vs calculated Franck-Condon factors1.2x10-31.00.80.60.40.20.0FCF derived from observed width10 x10-386420Calculated FCF修正(3)1+状態底付近分光行、得今回得観測結果合精密構成ab initio僅拡張Morse振動子(EMO)型、振動準位回転定数観測値一致修正(誤差0.05cm-1)14x103131211109Energy

10、cm-1109876543Internuclear distance Modified potential ab initio potential previous experiment今回分光領域修正基計算観測回転定数実験誤差範囲内再現遷移強度分布Franck-Condon factor説明20.8x10-320.620.420.220.0Rotational constant cm-111.8x10311.711.611.511.4Energy against v=91 level of X1+ cm-1 Observed ab initio ModifiedRotational cons

11、tants against energy levels傾1、計算用遷移双極子値1正考1 R.Beuc et al, J.Phys.B 39, S1191 (2006)Observed vs calculated Franck-Condon factors1.2x10-31.00.80.60.40.20.0FCF derived from observed width10 x10-386420Calculated FCF ab initio Modified Fitting to modified plots最適中間準位確定修正(3)1+状態遷移強度正予想Feshbach分子振動基底準位間Franck-Condon因子計算11 P.Naidon, private communications (2008)0.00124680.0124680.1Franck-Condon factor11.8x10311.711.611.511.411.311.2Energy cm-1 Feshbach molecu