One- and two-photon spectroscopy of highly excited states of alkali-metal atoms on helium nanodroplets.

Alkali-metal atoms captured on the surface of superfluid helium droplets are excited to high energies (≈3 eV) by means of pulsed lasers, and their laser-induced-fluorescence spectra are recorded. We report on the one-photon excitation of the (n+1)p←ns transition of K, Rb, and Cs (n=4, 5, and 6, respectively) and on the two-photon one-color excitation of the 5d←5s transition of Rb. Gated-photon-counting measurements are consistent with the relaxation rates of the bare atoms, hence consistent with the reasonable expectation that atoms quickly desorb from the droplet and droplet-induced relaxation need not be invoked.

[1]  C. Callegari,et al.  Electron spin pumping of Rb atoms on He nanodroplets via nondestructive optical excitation. , 2008, Physical review letters.

[2]  C. Callegari,et al.  High-spin alkali trimers on helium nanodroplets: spectral separation and analysis. , 2008, The Journal of chemical physics.

[3]  A. Hernando,et al.  Unraveling the absorption spectra of alkali metal atoms attached to helium nanodroplets. , 2007, The journal of physical chemistry. A.

[4]  C. Callegari,et al.  Optical spectroscopy of potassium-doped argon clusters. Experiments and quantum-chemistry calculations. , 2007, The journal of physical chemistry. A.

[5]  M. Pi,et al.  Squeezing a helium nanodroplet with a Rydberg electron. , 2007, The journal of physical chemistry. A.

[6]  C. Callegari,et al.  Triplet state excitation of alkali molecules on helium droplets: experiments and theory. , 2007, The journal of physical chemistry. A.

[7]  C. Callegari,et al.  Magnetic dichroism of potassium atoms on the surface of helium nanodroplets. , 2007, Physical review letters.

[8]  C. Callegari,et al.  Investigation of KRb and Rb2 formed on cold helium nanodroplets , 2006 .

[9]  R. Huber,et al.  Cesium dimer spectroscopy on helium droplets. , 2006, The Journal of chemical physics.

[10]  W. C. Martin,et al.  Handbook of Basic Atomic Spectroscopic Data , 2005 .

[11]  T. Möller,et al.  The electronically excited states of helium clusters: an unusual example for the presence of Rydberg states in condensed matter , 2005 .

[12]  M. Pi,et al.  Alkali Atoms attached to 3He Nanodroplets , 2004, cond-mat/0410696.

[13]  M. Mudrich,et al.  Spectroscopy of Cs attached to helium nanodroplets. , 2004, The Journal of chemical physics.

[14]  M. Shiga,et al.  Theoretical study on photoexcitation dynamics of the K atom attached to helium clusters and the solvation structures of K*Hen exciplexes , 2004 .

[15]  F. Stienkemeier,et al.  Formation times of RbHe exciplexes on the surface of superfluid versus normal fluid helium nanodroplets. , 2004, Physical review letters.

[16]  M. Pi,et al.  Surface location of sodium atoms attached to He 3 nanodroplets , 2003, cond-mat/0312281.

[17]  W. Ernst,et al.  Rb–He exciplex formation on helium nanodroplets , 2001 .

[18]  F. Stienkemeier,et al.  Formation of K*He exciplexes on the surface of helium nanodroplets studied in real time. , 2001, Physical review letters.

[19]  K. Yamashita,et al.  Path integral Monte Carlo study on the structure and absorption spectra of alkali atoms (Li, Na, K) attached to superfluid helium clusters , 2001 .

[20]  G. Scoles,et al.  Alkali-helium exciplex formation on the surface of helium nanodroplets. I. Dispersed emission spectroscopy , 2000 .

[21]  G. Scoles,et al.  Alkali-helium exciplex formation on the surface of helium nanodroplets. II. A time-resolved study , 2000 .

[22]  I. Hertel,et al.  COHERENCE AND RELAXATION IN POTASSIUM-DOPED HELIUM DROPLETS STUDIED BY FEMTOSECOND PUMP-PROBE SPECTROSCOPY , 1999 .

[23]  G. Scoles,et al.  HELIUM CLUSTER ISOLATION SPECTROSCOPY OF ALKALI DIMERS IN THE TRIPLET MANIFOLD , 1998 .

[24]  G. Scoles,et al.  Spin–orbit effects in the formation of the Na–He excimer on the surface of He clusters , 1997 .

[25]  G. Scoles,et al.  Spectroscopy of alkali atoms (Li, Na, K) attached to large helium clusters , 1996 .

[26]  M. W. Cole,et al.  The binding of alkali atoms to the surfaces of liquid helium and hydrogen , 1995 .

[27]  Hartmann,et al.  Rotationally Resolved Spectroscopy of SF6 in Liquid Helium Clusters: A Molecular Probe of Cluster Temperature. , 1995, Physical review letters.

[28]  A. Golov,et al.  A new type of excimer atom: electron + ionized helium cluster , 1993 .

[29]  P. Lerner,et al.  Surface of liquid helium as a trap for rydberg atom. Mechanisms of relaxation , 1989 .

[30]  I. M. Sokolov,et al.  Rydberg atom at the surface of liquid helium , 1986 .

[31]  J. Jortner,et al.  Rydberg States of Benzene in Rare‐Gas Matrices , 1969 .