4P014

� 2

Transversal momentum distribution of tunneling electrons from D2

in circularly polarized intense laser fields

Hikaru Fujise1, Takeru Nakamura1, Masateru Yamamoto1, Yuu Nagao1, Daimu Ikeya1, Akitaka Matsuda1, Mizuho Fushitani1, Akiyoshi Hishikawa1, 2

1 Department of Chemistry, Nagoya University, Japan 2 RCMS, Nagoya University, Japan

Abstract We measured the three-dimensional momentum of photoelectrons and ions

produced from molecular deuterium (D2) in circularly polarized intense laser fields, to evaluate the predicted characteristics of the transverse momentum distribution (TMD) of photoelectrons. The obtained TMD patterns exhibit a Gaussian distribution, with a clear laser intensity dependence, which is in quantitative agreement with the prediction by the weak-field asymptotic theory (WFAT).

2

2 1

,1

2

[1, 2] 2

2 [1]

Transverse Momentum Distribution: TMD TMD

2

[3]1 TMD

[4] 2Fig. 1: Schematic image of molecular orbital imaging with TMD [5].

Molecular orbital captured inthe cross section

y x

zCircularly polarizedlaser pulse

"Torus" like photoelectrondistribution

Fig. 1 TMD, D2

TMD 2

800 nm 1 kHz 45 fs 1/4

f = 100 mm D2

t x, yD2 D2 D + D+ + e- D+

,1

,1 xz, xy, yz Fig. 2(a)px, pz py

Fig. 1 ~1.0 a.u. 2

, D2

Fig. 2(b) D2 1sσg

2

TMD TMD2 WFAT

[5] 2 3,1 TMD 2

[1] T. Endo et al., Phys. Rev. Lett. 116, 163002 (2016)., [2] H. Akagi et al., Science. 325, 1364 (2009)., [3] L. Arissian et al., Phys. Rev. Lett. 105, 133002 (2010)., [4] O. I. Tolstikhin et al., Phys. Rev. A. 84, 053423 (2011)., [5] V. N. Pham et al., Phys. Rev. A. 89, 033426 (2014).

1.0

0.0

px (a.u.)

(b)

p z (a

.u.)

py (a.u.)

p y (a

.u.)

(a)

0

9045135

180

225270

315

D D

0 1 2-1-2

0 1 2-1-2

-2

-1

0

1

2

-2

-1

0

1

2

0.5

Fig. 2: (a) Three-dimensional photoelectron momentum images in the laboratory frame, obtained from D2 in circularly polarized laser fields 800 nm, 3.7 × 1014 W/cm2. (b) Red circles: photoelectron angular distribution in the molecular frame. Black line: fit curve of experimental data by the least squares method.